This lens far exceeded my expectations. I bought this lens to use mainly for video on my Panasonic G85, but I actually like it more than I thought. Focusing is very easy thanks to the smooth-running focus ring. I don't notice the corners because they are sharp enough for me and the center sharpness is very good. It has a nice warm undertone that I really like. The only thing that confuses me is that the aperture ring rotates too easily as I sometimes turn it with my finger when trying to focus. I like that it's clickless for video work, but it's too easy to accidentally rotate it. Fix that and this lens becomes a must-have.