Is the Nikon 18-55mm f/3.5-5.6G II AF-S DX Nikkor Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 55mm f/8.0 test image. Observe the contrast and resolution of these results.
Is the Nikon 18-55mm f/3.5-5.6G II AF-S DX Nikkor Lens set to 55mm f/8.0 sharper than the Nikon 50mm f/1.8G AF-S Nikkor Lens set to 50mm f/2.8? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.