Is the Canon EF 50mm f/1.8 II Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 50mm f/5.6 test image. Observe the contrast and resolution of these results.
Is the Canon EF 50mm f/1.8 II Lens set to 50mm f/5.6 sharper than the Canon EF 135mm f/2L USM Lens set to 189mm f/3.2? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.