Is the Canon EF 50mm f/1.8 II Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 50mm f/8.0 test image. Observe the contrast and resolution of these results.
Is the Canon EF 50mm f/1.8 II Lens set to 50mm f/8.0 sharper than the Tamron SP AF 17-50mm f/2.8 XR Di II LD IF Lens set to 17mm f/2.8? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.