It's just been discontinued this week, but the EF 24/2.8 might be worth a look and is still generally available. There are quite a few sample images here.
Main complaints... it's not a USM lens, so focus is a bit noisy. And the manual focus ring is pretty narrow.
I've used a variety of 24mm lenses in various camera systems over the years. A couple have been f2.0, but most have been f2.8. That's usually fast enough for a wide lens. Probably makes for a sharper, more easily corrected lens than one that stretches the limits in order to have a big aperture.
Reasons I don't have the EF 24/2.8 now are that I've got the focal length covered with two zooms and a tilt shift lens, plus have the 20/2.8 and 28/1.8. Didn't feel the lack of a 24mm for 5 or 6 years while shooting only crop sensor cameras... but sometimes I do now, shooting full frame. I don't really want a big, heavy, expensive f1.4 lens. I wish Canon would make one maybe no faster than f2, but f2.8 would have been fine, too, if it had USM. IS isn't necessary either, especially if it helps keep the lens affordable.
It isn't available yet, but just judging from the MTF charts, the new 24/2.8 USM IS isn't much of a replacement, doesn't bring anything dramatically new to the table in terms of IQ... Especially considering its $850 price tag (more than double the list price of the non-USM/IS lens). Maybe I just don't get what Canon is trying to accomplish with the two new, pricey, IS wide primes.