Is the Sigma 24mm F2 DG DN Contemporary Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 24mm f/5.6 test image. Observe the contrast and resolution of these results.
Is the Sigma 24mm F2 DG DN Contemporary Lens set to 24mm f/5.6 sharper than the Sony FE 20mm F1.8 G Lens set to 20mm f/1.8? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.