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 360mm f/7.1 test image. Observe the contrast and resolution of these results.
Is the Canon EF 180mm f/3.5L USM Macro Lens set to 360mm f/7.1 sharper than the Canon EF 200mm f/2.8L II USM Lens set to 400mm f/5.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.