Is the Canon RF 24-105mm F4-7.1 IS STM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 105mm f/7.1 test image. Observe the contrast and resolution of these results.
Is the Canon RF 24-105mm F4-7.1 IS STM Lens set to 105mm f/7.1 sharper than the Canon RF 24-105mm F4 L IS USM Lens set to 85mm f/11.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.