It's not the number of points that's the issue. The 40D/50D has 9-point AF too but it kicks the 5D(mkII) AF's butt. The AF points on the 5D(mkII) are closer together, relative to the frame. This, to me, makes it less useful in terms of selecting one of the side points to do something in portrait mode. It also has only one cross-type AF point (center). The AF on the 40D/50D are all cross type, they're spread better, and in my experience, the AF is faster. The other thing that I would have expected on a body of this class is that spot metering should be on the selected AF point. In short, the 5D(mkII) has the same AF the 10D had that it was based on. Things have evolved since then...