Normally when I buy a lens I test for AF focus myself and not surprizingly, I find that in all cases the AF is off at least a bit and sometimes quite a bit more (as in the case of a recent purchase of a 100 L macro). Normally I dont use MF adjustment and send it in to Canon for free calibration - thinking that the lens is at fault not the body. In all cases it comes back with near perfect focus on my 5d Mark II body - so I know at least my current body is not the problem. I know some of you may suggest sending lens and body in for calibration, but I would have thought that might not be the best idea in case Canon just uses the MF adjustment instead of adjusting the lens itself. In that case a second body purchase could introduce AF problems again.