I just got a 5D3 and I'll tell you why. I actually wanted to upgrade at about time time the 7D came out but I really wanted to go full frame. I couldn't quiet bring myself to get the 5D2 because I wanted the AF and frame rate of the 7D. I basically froze in my decision then soon heard about the 5D3 so I waited... over a year!
While I'm doing all the research now, I am thinking that I'm going to end up waiting until we see what comes out at Photokina this year and then make the decision. It's most likely going to take me that long to save up all the funds anyway, but I'd like to narrow down my decision and then go from there.
I got my 5D3 this week and am thrilled to bits with it. It's everything I wanted it to be. The best of the 5D2 and the best of the 7D in one camera plus a little bit more. That's not to say I didn't hesitate when I saw the price of the 5D3 however.
The price thing is my biggest detractor from the 5D3. It just seems like a lot to spend and I tend to over analyze things and have seen a lot of people having issues with it...but their issues seem to be in things I don't tend to care much about, but it still gives me pause.
If your main interest is landscapes then I actually think you'll appreciate a full frame camera more than a crop. And if fast focus isn't so important then maybe a 5D2 will be perfect for you. I like to shoot some sports which is why the 5D3 AF is so important to me.
Saying that, if you also shoot wildlife then maybe the 7D will be best for you as you can get longer reach with your current lenses and fire a burst of shots off to try to capture 'the moment'.
You know, you could always get a 5D2 and a 7D for the price of a 5D3. Then you could have a landscape camera and a wildlife camera. You'd never need to swap a lens when you're out and about again!
Do you do much low light work? If so the 5D3 starts to be the more attractive option.
I definitely think I want to go FF, but I do enjoy doing wildlife at times. Though you raise a good point with buying a 5D2 and a 7D for the price of a 5D3. I honestly hadn't even thought about that....hmmmmm....
And any low light work I do is usually just shooting landscapes at sunset or sunrise. Occasionally some star traces or something like that, so I'm not sure how much of a benefit the 5D3 would give me there either. I've never really worked with any of the 5D models.
Thanks for all your input. Gives me some more things to think about!