The top lens that works wonderfully with my 5D Mark II. The focal length is spot on for allo round photo such as hubbub, interior, spontaneous portraits, party photography, fishing, food photo, children photo etc.
Nice + focal
+ Good build quality. Not armor build as many other L, but good.
+ Very sharp already at full open (1.4)
+ Nice bokeh
+ Very quick and accurate AF
+ Smooth Size
Negative sides missing. Besides the price is relatively high, of course, but it's up to the buyer to assess affordability.
I recommend the purchase to anyone who wants a new best friend in a camera bag. Email me if you want some test images in 21Mpix.