Is the Zeiss 100mm f/1.4 Otus Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 100mm f/2.0 test image. Observe the contrast and resolution of these results.
Is the Zeiss 100mm f/1.4 Otus Lens set to 100mm f/2.0 sharper than the Nikon 105mm f/1.4E ED AF-S NIKKOR Lens set to 105mm f/1.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.