Is the Venus Optics Laowa 12mm f/2.8 Zero-D Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 12mm f/3.2 test image. Observe the contrast and resolution of these results.
Is the Venus Optics Laowa 12mm f/2.8 Zero-D Lens set to 12mm f/3.2 sharper than the Canon EF 11-24mm f/4L USM Lens set to 14mm f/4.5? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.