Is the Zeiss Otus 55mm f/1.4 Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 55mm f/2.8 test image. Observe the contrast and resolution of these results.
Is the Zeiss Otus 55mm f/1.4 Lens set to 55mm f/2.8 sharper than the Canon EF 50mm f/1.2L USM Lens set to 50mm f/1.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.