Summary: Very sharp. Little distortion. It was my favorite lense until I dropped my camera and the lense took the full impact of the drop. I would've purchased another copy if I hadn't upgraded to a full-frame camera.
Summary: As everyone else has described, my wife and I have some great photos with this lens, and it's a nice compact one to travel with. It does great macro shots with small depth of field, and it is decent at distance. The low light shots always come out pretty great.
Summary: Would be 5 star if not the wobbly front element. I bought mines used. The pictures produced are sharper than what you get from kit lenses and it even beats the other f2.8 canon series of 40mm and 24mm pancakes which I also own. The constant f2.8 aperture is amazing.