Is the Canon RF 24-105mm F4 L IS USM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 85mm f/5.6 test image. Observe the contrast and resolution of these results.
Is the Canon RF 24-105mm F4 L IS USM Lens set to 85mm f/5.6 sharper than the Canon RF 24-240mm F4-6.3 IS USM Lens set to 100mm f/6.3? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.