Is the Sony FE 24-70mm F2.8 GM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 35mm f/16.0 test image. Observe the contrast and resolution of these results.
Is the Sony FE 24-70mm F2.8 GM Lens set to 35mm f/16.0 sharper than the Tamron 35-150mm f/2-2.8 Di III VXD Lens set to 150mm f/5.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.