I'm currently going through the 900+ pictures I recently made with mine in Denmark and Sweden. I took thousands of photos with it on the eight major trips I have taken since the fall of 2016. I have yet to notice any problem with corners beyond what one might reasonably expect. I shoot RAW and let the lens profile adjustments be used automatically. They also are used in camera for JPEGs. The camera can be so compact because they do not add 3 pounds of corrective lens elements. Flaws are dealt with in software. For my purposes, that works beautifully. I make 13" x 19" prints of some of my best shots to frame and hang on my walls. The lens and the 1" sensor work fine for that.
YMMV, and maybe I'm not adequately critical. I expect more from my L lenses with a FF sensor, but I don't miss them and wish I were lugging them around when I travel. Maybe you can tell something from the small pictures I've posted from Edinburgh, for example.
http://www.stevelee.name/britain/scotland/edinburgh/index.html