Is the Sony FE 28mm F2 Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 28mm f/2.2 test image. Observe the contrast and resolution of these results.
Is the Sony FE 28mm F2 Lens set to 28mm f/2.2 sharper than the Sony FE 24mm F1.4 GM Lens set to 24mm f/1.6? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.