Thanks for the replies. Money is an object when considering some suggestions to buy every Zeiss prime in that focal range. Hover money isn't an factor when comparing an $800 lens to a $1400 lens.
I actually own the 17-40. It's a great lens. It is my oldest Canon lens now at about 10 years old. I used to use it often when I shot crop sensor bodies, but now that I am all full-frame, I don't use it as much.
What prompted this post is should I try to talk myself into getting the 16-35 since it is on rebate now (B&H for $1398) or just keep the 17-40. The 17-40 is my slowest lens now, but other than being f4, I am happy with it.
Still can't decide what to do. When will Canon have a 14-24?
Also, I've learned my lesson a few times over by buying non-Canon lenses. Sorry, some of you might think that decision is short-sighted, but I have never really gone wrong with a Canon lens. The only brand that I would really consider besides Canon is Zeiss. That comes from many many years shooting Hasselblads back in the film days.