my favorite standard wide for m43. Very sharp, colors look great, no distortion around the corners, excellent build quality (light but strong). The sliding focus ring doesn't work well for video, apparently a lag in the electronic focus mechanism. Overall I like this lens and haven't found a better 12mm on the mft. Tried manual 12mm exposure (SLR magic) but wasn't happy with the sharpness or flare but it's the only lens that comes close to the Oly.