Is the Nikon 70-200mm f/2.8G AF-S VR II Nikkor Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 85mm f/2.8 test image. Observe the contrast and resolution of these results.
Is the Nikon 70-200mm f/2.8G AF-S VR II Nikkor Lens set to 85mm f/2.8 sharper than the Tamron 70-200mm f/2.8 SP Di VC USD 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.