Review on Laowa 9mm f/2.8 Zero-D SLR Ultra-Wide Lens - Ultimate Wide-Angle Photography with Sony E Mount by Major Lindsay

Image quality is pretty good but as others have pointed out there is a bit of vignetting which isn't a big deal if you're doing a post - will be edited. The only minor issue is that the lens mount fits the camera body pretty snugly. I've noticed that most aftermarket X-mount lenses may not do this and some do a better job. It seems to wear out with use. I like the compact size and the all-metal body. It is better to buy a Samyang or Rokinon 12mm if you can choose a narrower focal length.