I got this and several other lenses, along with the A7RIII and A9 bodies, from Sony to try out. This is best 16-35 I've used, noticeably better than the Canon that I currently own. The center and mid-areas are critically sharp wide open, and the corners are very good. One stop down and image quality corner-to-corner is outstanding. For me, this is the perfect landscape lens, especially when shot on the A7RIII - the fine detail throughout the image is the best I've experienced. If you want the best in this range, this is it.