Hi I'm considering purchasing a 5dmk2 as a third camera since the prices are really good at the moment, but it seems to get a lot of bad reviews regarding it's auto focus. Can you 5dmk2 owners share your thoughts and is the AF really that bad. I would be using it for weddings and portraits.
Honestly, my 5DII is my first SLR with AF. I find it "bad" in that it has AF at all and everything that comes with it (smaller and dimmer viewfinder, harder to use manual focus, dependence on more expensive and more vulnerable lenses, etc).
Once I was over that I don't find it "bad" at all - it is way better than this weird reputation that has been building up in various forums. For what it is it works just fine, even in rather bad light.
I understand that the 1-series or 7D AF is better - but then again it's not fabulous either in my view. The spread of the AF points is still rather centered and doesn't even fully hit anything that you might want to place further out when thinking rule-of-thirds. So recomposing often will be necessary anyway.
It all depends on the application obviously. There are probably better choices for sports, bird and other fast action shooters (not just because of the AF). For pretty much everything else I don't see how it makes much of a difference under normal circumstances. And I've gotten decent results even for soccer, sled dogs, birds, etc