Is the Canon EF 135mm f/2L USM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 270mm f/4.5 test image. Observe the contrast and resolution of these results.
Is the Canon EF 135mm f/2L USM Lens set to 270mm f/4.5 sharper than the Canon TS-E 135mm f/4L Tilt-Shift Macro Lens set to 189mm f/6.3? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.