I haven't tried it myself, but the reviews I've read are good, although they say it isn't as sharp as it's big brother the 21mm, but also consider the Zeiss 18mm f/3.5 Distagon if you need something a little wider. It's cheaper than most of the others available, such as the Zeiss 21, Canon f/1.4 24 MkII and 14 MkII, as well as the tilt/shift options.