On my 1.6 body, I needed something wider than the 50mm 1.8, so I bought this little beauty. It's very sharp, and light. It provides something more closer to the 50mm lens, which is good for indoor shots. If I can afford it, one of these days I may upgrade it to a 35L, but It'll take a lot of convincing on the differences (aside from price) before I give up my 35 2.0
It's easier to tug around, than my 24-70, so I take it to functions and events.