I own the 24-70 2.8L and the 24 - 105 4.0L. my biggest gripe has been the the lack of sharpness on the edges at the widest angle at 24 mm, as well as the darkness around the edges during indoor group shooting. I purchase the 24 mm 2.8 IS because I was tied of the poor quality of my wide angle group shoots with the 24-70, I must say this lens is a breath of fresh air, I am quite please with the results. I f you find yourself shooting a lot of indoor group shoots, this lens will will make one very happy, I considered the the 24 mm 1.4 L but this is a pleasing cheaper alternative.
July 27, 2012
Please be advised that when EF 24mm f/2.8 IS USM is used with EOS-1D Mark IV, the firmware of the camera should be updated to version 1.1.1 or later. The firmware is to be released in March 2012. The update helps to optimize the exposure accuracy.
Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.