Haha congratz on the 135L Denise!

Not to be rude Mark, but I tested the 17-40 once and it was absolutely horrible in the FF corners. How is that for you? I might have used a bad copy, but a friend of mine bought it for his 7D and he doesn't like it either.
The 17-55 definitely had better IQ, even though it misses the weather-sealing part that I like in the 17-40. Also F4 in FF is not that bad, however on a crop camera it's nice to get a little less DOF from time to time.