Is the Nikon 55-200mm f/4-5.6G AF-S DX VR II Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 135mm f/5.0 test image. Observe the contrast and resolution of these results.
Is the Nikon 55-200mm f/4-5.6G AF-S DX VR II Lens set to 135mm f/5.0 sharper than the Nikon 18-140mm f/3.5-5.6G AF-S DX VR Lens set to 140mm f/8.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.