Is the Irix 11mm f/4 Firefly Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 11mm f/4.0 test image. Observe the contrast and resolution of these results.
Is the Irix 11mm f/4 Firefly Lens set to 11mm f/4.0 sharper than the Venus Optics Laowa 12mm f/2.8 Zero-D Lens set to 12mm f/11.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.