Is the Canon RF 70-200mm F4 L IS USM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 70mm f/4.0 test image. Observe the contrast and resolution of these results.
Is the Canon RF 70-200mm F4 L IS USM Lens set to 70mm f/4.0 sharper than the Sony FE 70-200mm F4 G OSS Lens set to 100mm f/5.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.