Is the Canon TS-E 90mm f/2.8 Tilt-Shift Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured S=-11mm f/11.0 test image. Observe the contrast and resolution of these results.
Is the Canon TS-E 90mm f/2.8 Tilt-Shift Lens set to S=-11mm f/11.0 sharper than the Nikon 85mm f/2.8D PC-E Micro Nikkor Lens set to -11mm f/11.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.