Is the Canon EF 180mm f/3.5L USM Macro Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 180mm f/3.5 test image. Observe the contrast and resolution of these results.
Is the Canon EF 180mm f/3.5L USM Macro Lens set to 180mm f/3.5 sharper than the Nikon 200mm f/4D AF Micro Nikkor Lens set to 200mm f/4.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.