Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Probably the best lens I own

Let me first start off by saying - long time canon user. I own 6 or 7 lenses, including three L series lenses, and this is by far one of my favorites - if not my absolute favorite.I shoot mostly glamour and erotica type work on a 20D. So right there, this lens is not a true 15mm for me - but 1.6x15mm.It's sharp as a tack. It's light weight. It's very short (I call it the nub lens). And it's autofocus is amazing.Very little barrel distortion...and highly recommended. This lens is probably as sharp (if not sharper) than my 24-70 2.8L or my 17-40 4.0L lens.