Is the Zeiss Milvus 100mm f/2M Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 100mm f/5.6 test image. Observe the contrast and resolution of these results.
Is the Zeiss Milvus 100mm f/2M Lens set to 100mm f/5.6 sharper than the Tamron 90mm f/2.8 Di VC USD Macro F017 Lens set to 90mm f/4.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.