I have to say that when it comes to Hasselblad, the autofocus is extremely accurate.....100% of the time. It's not a predictive system like you will find on a 35mm system, but more accurate on a non-moving subject than any I've experienced. I also feel it is decently fast for a MF system. I don't ever feel like I'm waiting for it to do it's job except maybe on the 120 macro, which has an extremely long travel. (generally with MF subject matter it doesn't make sense to let the autofocus do all the work..coarse focus manually, and then let the AF do the fine tuning, it's more accurate than the viewfinder optical system).
Barry