If you are looking for a great general purpose lens that also does 1:1 macro, consider the much less expensive
Canon EF 100mm f/2.8 Macro lens. It focuses much faster, has similar image sharpness and comes in a better portrait and general use focal length. The 100mm macro is handholdable at lower
shutter speeds than the 180 (about 1 stop lower at comparable apertures) when flash is not used as the main light. It offers excellent optical performance and middle of the road focal length, working distance and size/weight. The 100mm macro is bargain-priced while the 180 L is
priced in the serious-photographer-only range. The 100mm focal length makes a decent medium-to-tight portrait lens as well.