Close focus, something I really like at wide angles, is apparently a problem for the 24-70 2.8 II.
But close focus is a strength of the 24 and 28 2.8 IS lenses, and probably also with the wide 1.4's
I also read that before I bought it, it worried me. Haven't even thought about it until you mentioned it. I shoot up close but a non-issue for me. Try the 50 L up close