The Canon EF 85mm f/1.2 L II USM Lens is the widest aperture lens Canon currently makes (update: now the Canon EF 50mm f/1.2 L USM Lens shares this aperture) - allowing handholding and action stopping in the darkest conditions. The background blur capable of being produced by the Canon EF 85mm f/1.2 L II USM Lens is stunning.

It takes a lot of glass to be that fast - and it sure looks nice.
It is especially attractive with that red ring around the end of it. :)
The biggest downside to the original
Canon EF 85mm f/1.2 L USM Lens
was the very slow focusing speed.
If you were shooting portraits, it didn't matter.
But, a lens this fast begs to be used for indoor action sports.
Canon has utilized the latest USM (Ultrasonic Motor) in this lens for faster (I wouldn't give it a "fast" rating yet) and near-silent autofocus.
The Canon EF 85mm f/1.2 L II USM Lens' improved focus mechanism is about 1.6x faster than the original lens -
noticeably faster and a very nice improvement, but not as fast as Canon's fastest autofocusing lenses.
While this lens certainly has the aperture and image quality to be an excellent indoor action sports lens,
the AF performance is only "good enough" in my opinion - and not matching the
Canon EF 85mm f/1.8 USM Lens' AF performance.
Would I use this lens for sports?
Definitely, but I would plan on a lower hit rate - especially with the tiny depth of field at f/1.2.
Shoot more images to compensate - The shots that hit will be superior images.
While manual focusing is also improved, I am a somewhat disappointed that the
Canon EF 85mm f/1.2 L II USM Lens still utilizes a full-time electronic manual focus override.
Electric manual focus utilizes the focus motor to adjust focus while you turn the focus ring.
The camera must be powered on for manual focus to work.
I can't say I am inhibited by this feature, but it is not my favorite attribute of this lens.
The AF motor is always slightly behind me in this focus-by-wire setup.
Manual focus lag is slightly improved over my 85mm version I.
The undamped focus ring turns too freely in my personal opinion.
It is super smooth, but harder to fine tune.
Avoid grasping the MF ring when mounting/dismounting the lens.
Since the Canon EF 85mm f/1.2 L II USM Lens is a front-focusing lens (part of the slower focusing speed reason I'm sure),
the lens extends a small amount while focusing.
I prefer non-extending lenses, but the amount of extension in relation to the size of the lens is relatively small.
Care is required during lens changes to avoid scratching the rear lens element as it is seated at the back of the lens mount making it susceptible to damage.

The Canon EF 85mm f/1.2 L II USM Lens pictured above is extended to its maximum length (minimum focus distance).
Image quality was excellent on the original 85 L, but using Super Spectra coatings and optimized lens element shaping
to suppress flare and ghosting should make the 85mm f/1.2 L II an even better performer.
Anti-reflective material has been placed inside the lens barrel as well.
In reality, I am seeing only very slightly improved image quality - but it is still excellent.
In certain situations, I am seeing less flare.
Both 85mm L lenses are noticeably better at controlling flare than the 85mm f/1.8.
The biggest image quality difference I am seeing between the I and II lenses is a slightly more neutral color from the new lens.
The original 85 L was sharp even at f/1.2 and it got even sharper when stopped down a small amount.
The new lens appears very similar to me.
Real life shots are very useable at f/1.2.
My biggest problem with comparing the two lenses has been getting both to focus identically.
Having had or used 5 different 85 L II lenses, I've determined that this lens model will occasionally mis-focus completely.
The lenses do not front focus or back focus consistently and mostly focus dead-on.
But the is a random situation that delives a completely out of focus shot.
The DOF is extremely shallow at f/1.2 with a relatively close subject - accurate focusing is mandatory - and recomposing after focusing will generate out of focus shots.
The ISO 12233 Chart sample crops will show the older 85 L to be sharper wide open.
In real shots, these lenses are more similar than the sample crops show (including those shot using manual focus and the 2.5x Canon Angle Finder C).
The original 85 L showed noticeable vignetting at f/1.2 (even on a 1.6x FOVCF body.
Full frame users saw vignetting nearly disappear by f/2.
The Canon EF 85mm f/1.2 L II USM Lens performs identically.
The Canon EF 85mm f/1.2 L II USM Lens has about 1 stop of vignetting advantage over the
Canon EF 85mm f/1.8 USM Lens.
All three copies of the Canon EF 85mm f/1.2 L II USM Lens I have used to date show more CA (Chromatic Aberration) than the older 85 L.
And my 85 f/1.8 shows less CA than either version of the 85 L lens.
The 85 II lenses I have used are producing noticeable CA at the widest apertures when sun glares from something reflective in the shot (such as a chrome car bumper).
For most applications, the CA will not be a big deal - and removing it in post-processing is often possible.

Pictured above are the Canon EF 85mm f/1.8 USM Lens and the Canon EF 85mm f/1.2 L II USM Lens. The same are pictured below with their lens hoods mounted.

Since I don't feel the above pictures tell the complete story, I am including an objective end comparison below ...

Combining an 8-blade circular aperture diaphragm with an f/1.2 aperture, the Canon EF 85mm f/1.2 L II USM Lens is the
master of background diffusion for this focal length or anything close.
Open the Canon EF 85mm f/1.2 L II USM Lens up and watch the background disappear.
The result is very appealing.
Background distractions are gone.
Keep in mind - DOF (Depth of Field) is razor thin at f/1.2.
Unless you are far away from your subject, you must hit your focus perfectly.
Plan on your focus hit rate being lower when shooting at f/1.2 - take additional pictures to compensate.
The other benefit of the extremely wide f/1.2 aperture is the simple fact that it lets in a lot of light.
The result is that lower, less-noisy ISO speeds can be used and higher handholdable, action-stopping shutter speeds can be obtained.
While the circular aperture diaphragm is a nice new feature, I haven't hit the right scenarios to see this make much difference in my images to date.
The circular design attempts to keep the background blur attractive even when the lens aperture is stopped down.
Most lenses have round apertures with they are wide open.
Although it is not an issue to me personally, I should note that the Canon EF 85mm f/1.2 L II USM Lens' minimum aperture is a somewhat-wide f/16.
Slight barrel distortion is visible in the 85 L II.

Pictured above from left to right are the Canon EF 35mm f/1.4 L USM Lens, Canon EF 50mm f/1.2 L USM Lens, Canon EF 85mm f/1.2 L USM Lens and Canon EF 24-70mm f/2.8 L USM Lens. The same lenses are pictured below with their included lens hoods.

Now with distance information.
Unlike its predecessor, the Canon EF 85mm f/1.2 L II USM Lens passes distance information to the E-TTL II flash algorithm.
This lens is going to show up at a lot of weddings and other similar events where flash is often used.
Adding this parameter to the flash exposure computation is beneficial.
With a closest focusing distance of 37.4" (0.95m), the Canon EF 85mm f/1.2 L II USM Lens is not going to be mistaken for a macro lens.
Maximum magnification is a low 0.11x.
Extension tubes help - magnification 0.25x-0.15x with the Canon EF 12mm Extension Tube II
and 0.42x-0.33x with the Canon EF 25mm Extension Tube II.
The Canon EF 85mm f/1.2 L II USM Lens is not compatible with Canon's Extenders.
Based on outward appearance, not much has changed from the original 85 f/1.2 - Lots and lots of glass housed in a strong body.
At 3.6" x 3.3" (91.5 x 84.0mm)(maximum diameter x length) and 36.2 oz (1025g), the Canon EF 85mm f/1.2 L II USM Lens is fat and heavy.
While I considered this a detriment when I first used the original 85 L, I now don't mind the weight/density of this lens.
Because I am frequently using the this lens in low light conditions, my shutter speed is often dragging (long).
The lens anchors very well into my hand aiding steadiness - The weight of the lens helps it to remain still during the shot.
A rubberized grip surface helps control the camera/lens combination.
The Canon EF 85mm f/1.2 L II USM Lens retains the 72mm filter size of the original 85 L.
It also uses the same lens hood and lens pouch.
Both the ES-79 II and the LP1219 lens pouch are included with this lens.
The clip-on lens hood is very easy to install and remove - it is very forgiving to installation misalignment.

With improved AF speed, the Canon EF 85mm f/1.2 L II USM Lens is destined to be the choice of many as their indoor sports lens of choice.
If 85mm is the focal length you need, this lens will capture your subject against a smoothly blurred background much better than
any other available lens close to this focal length.
The crowd will become a colorful blur while the basketball player is frozen in action.
There is a significant difference in the background blur at f/1.2 compared to f/1.8 or higher.
There is a 2x difference in shutter speeds at these two wide open apertures.
The Canon EF 85mm f/1.2 L II USM Lens excels at portrait photography - Canon calls it their "definitive portraiture lens".
The 85mm focal length combined with excellent bokeh (evenly graduated blurring of out-of-focus areas) is perfect for portraits.
The Canon EF 85mm f/1.2 L II USM Lens is an excellent low-light lens for handholding at events.
The 85 f/1.2 L II is one of the best wedding lenses available.
Taking pictures around the house using available light, shooting church events, photographing a speaker or business event, still life photography ...
There are many uses for the Canon EF 85mm f/1.2 L II USM Lens.
Canon EF 85mm f/1.2 L II USM Lens Sample Pictures