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If you have 5D2, no need to switch to 5D3, I think. Thanks for looking!
I don't agree with this, I have both and there are a lot of reasons to switch if you shoot wildlife and especially BIF. Also if you shoot the L primes, the new AF shines with these lenses. If you are primarily shooting landscapes or studio then probably would agree there is no huge benefit other than the new ergonomics and just better experience in the menus etc...
However, of course with these type of shots the 5D2, 7D etc... could take them as Gyroscope said but having all 3 of these bodies in my possesion right now, I would say that for just using the camera, the 5D3 blows the 5D2 away and the AF on it blows the 7D away so lots of reasons to consider the new camera if you like new gear