Jeff Spirer , Sep 28, 2011; 04:19 p.m.
I use the 24-70 for portraits all the time with a 1.3x body. I don't sit at 70mm, especially indoors. I do use the 70-200, but I'd say that's about 10% of the time, not enough that I would worry about. I also use the 17-40 for portraits on a 1.6x body. I've had no complaints about "distortion," the only problem I have is that at events, it isn't always wide enough.