It's probably one of the most underrated lenses around. It gets vastly outsold by its very-slightly-cheaper little sister the EF 85/1.8, the macros 100 f/2.8 L and non-L, and its bigger brother the 135/2.0 L. Now that the 24/28mm primes have been replaced it's also probably one of the oldest designs. But it's the fastest around in its focal length, it's perfectly usable wide-open, frankly it doesn't even need updating (although if it did receive an update, even just new coatings and whatever better quality glass has been invented in the last 20 years, and a circular aperture, it would be as amazing as the 135/2L. Maybe that's why it's not being updated.).
It also works rather nicely with Extension Tubes for Macro work:
(clicky linky for 100% biggy)