Is the Canon EF 85mm f/1.4L IS USM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 85mm f/2.0 test image. Observe the contrast and resolution of these results.
Is the Canon EF 85mm f/1.4L IS USM Lens set to 85mm f/2.0 sharper than the Canon RF 85mm F1.2 L USM Lens set to 85mm f/2.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.