DPReview: \"One of the most common complaints we\'ve seen about the 5D Mark II is that it still has the same AF system as the original 5D. Why is this?\"
\"Firstly the market\'s evaluation of the 5D\'s AF system has been very positive; there have been no complaints from users, with everyone saying it\'s very good. Given that, to a certain extent, we think we shouldn\'t change it. And also there\'s some limitation with size; the AF sensor in the 50D is very big; the one in the 5D is much smaller. If we wanted to have all cross-sensors in the 5D Mark II, it would mean we might have to sacrifice the compactness of the body. It\'s all a question of balance of features and benefits.\"
