I'm new to the 15mm and this is one of my first shots with it. I'm not quite sure yet what to think about the lens, because I thought it would behave a little differently. I knew before that it wouldn't be the sharpest in the corners (even at F11 it's not completely sharp), but I'm facing also quite heavy Chromatic aberrations in green and purple. I'm not that satisfied with the Focus as well. If I use the Infinity-setting on the scale, everything is unsharp. If I want to have sharpeness in Lanscape pictures I have to set it to slightly more then 1m on the distance scale, but not to infinity. Probably I also have to find the right correction setting for the camera first, because with zero focus-correction I won't get sharp images in Autofocus.