Vignetting, flare and distortion test results along with specs, measurements and standard product images have been added to the Canon EF 24-105mm f/4L IS II USM Lens Review page.
You are going to see some improvements here. As always, you are welcome to share your thoughts in the comments section.
B&H has the Canon EF 24-105mm f/4L IS II USM Lens available for preorder and in stock in the 5D Mark IV kit.