None the less it's better than the 5D MKII.
My
400D was better than the 5D II. My 20Ds were much better. The 7D isn't even in the same postcode. The 5D III system is apparently pretty similar in practice to the 1D III and IV systems, which is to say really, really good. Pretty pricy unit, but worth it I suspect. But in the end, I just can't justify spending that kind of money for, when it's all said and done, functionality I don't need. For the stuff that really needs a decent AF system, I use the 1D IV and the 7D anyway, and I have an old 50D as a spare that does odd jobs, so the 5D II is only used for landscapes, nearly always using the 24-105. Yep, I have to do a lot of tedious focus and recompose 'coz the AF points are (a) not much good at getting a grip, and (b) all clustered incontinently in the centre of the viewfinder instead of spread out where they might be useful, but landscapes don't fly away in a hurry, so it's just annoying, not critical.
Also, the 5D II's metering seems to be shonky. I'm not sure what the go is there, I'd have thought it would be the same, more or less, as the 20D and the 40D. But it isn't. It consistently gets things wrong no matter which mode I use and I don't know why. Possibly the metering sensors, like the AF sensors, are badly distributed, or may there is some other reason. You just can't tell what it's going to do, whether it's going to under-expose by 2 stops, over by 3, or confuse the daylights out of me by doing it perfectly. Anyway, with the 5D II in hand I wind up doing a hell of a lot of manual exposure instead of using aperture priority (my usual habit unless I'm using flash). The 5D II gets stuff wrong so often that I find it easier just to figure out the exposure myself. I kind of like that, in a way, it forces me to become a better photographer and hone my own skills instead of just mindlessly letting the technology do everything for me.
Despite those glaring faults, it produces beautiful images, and does so under all sorts of lighting conditions. So yes, when the time comes I'll very gladly swap it for a 5D III (or a 5D IV probably by then) and be thankful for the vastly better AF and metering systems. But in the meantime, I can't imagine what would improve the actual pictures it takes (as opposed to the annoyance involved in taking them), so I guess it will be a few years yet.