I have discovered a hidden gem in the canon EF lens lineup! The EF 28mm f/1.8 USM lens has never really received exceptional praise or glowing reviews. I honestly don't know why! On digital SLRs (namely full frame and 1.6x bodies) it's perfect for available light photography.
F/1.8 is a definitely bonus; Fast AF; Decent build quality; Not too expensive; Works on any EF-Mount camera
Could be a tad bit sharper wide open (fixable in post production however, Small amounts of CA can be seen at wide apertures (also correctable, Plastic vs; metal construction (personal preference