14-24 f/4 makes no sense whatsoever. 17-40 is perfectly fine for all intents and purposes. A 14-24 would have to be f/2.8 to pique my interest, but only if it had Godlike corner to corner sharpness. Even then, the featherweight 17-40 would probably be my choice, since any subject I'd be shooting wider than 24mm would be static and I'd have a tripod with me. UWA's distort people waaay too much for my taste, and in such an unflattering way. I'm seriously contemplating picking up an 8-15 fishy for UWA purposes instead of a 17-40 or 16-35.
It makes perfect sense for those who want a zoom lens from 14 to 24mm. If you don't like the 14-24 because of distortion of people, how is an 8-15 going to be better? Or do you mean you want one or the other?