Is the Sigma 35mm f/1.4 DG DN Art Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 35mm f/1.4 test image. Observe the contrast and resolution of these results.
Is the Sigma 35mm f/1.4 DG DN Art Lens set to 35mm f/1.4 sharper than the Sigma 35mm f/1.2 DG DN Art Lens set to 35mm f/1.2? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.