You guys that print big. How big ? and if that were the case would'nt medium format be the proper option??
Of course there are some of you that print really big, but I think you are in the minority. Fashion photographers or pros shooting for advertisements typically don't shoot with a 5D - they'd be better served with a 1D body or even medium format digital.
Having said that, I admire you guys and girls who print poster-sized prints and hang them on your walls - good for you.