Is the Canon TS-E 17mm f/4L Tilt-Shift Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 34mm f/16.0 test image. Observe the contrast and resolution of these results.
Is the Canon TS-E 17mm f/4L Tilt-Shift Lens set to 34mm f/16.0 sharper than the Rokinon (Samyang) 24mm f/3.5 Tilt-Shift Lens set to 24mm f/5.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.