Is the Nikon 18-200mm f/3.5-5.6G AF-S DX VR II Nikkor Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 135mm f/6.3 test image. Observe the contrast and resolution of these results.
Is the Nikon 18-200mm f/3.5-5.6G AF-S DX VR II Nikkor Lens set to 135mm f/6.3 sharper than the Nikon 18-105mm f/3.5-5.6G AF-S VR DX Nikkor Lens set to 70mm f/5.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.