Is the Canon EF 200mm f/2L IS USM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 280mm f/3.2 test image. Observe the contrast and resolution of these results.
Is the Canon EF 200mm f/2L IS USM Lens set to 280mm f/3.2 sharper than the Canon EF 200mm f/1.8 L USM Lens set to 200mm f/1.8? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.