The 5D2 has less moire than the 6D, with the 5D3 providing the best video quality. That said, the 5D2 is unbeatable considering price, build, and overall value. Personally, the 5D3 can be skipped until the 5D4 is released if you are a 5D2 user. The AF is the largest differentiating factor of the 5D3 compared to the 5D2, with the 6D serving as almost a joke in Canon's lineup... even though the IQ is great, the rest of the camera falls apart and destroys any appeal as an option, even if the current offering at b+h is only $100 more than the 5D2 kit.