The only thing I missed in my 6D (that I had in 5D2) is the CF card slot. In most other aspects it is better than 5D2 and just as good in the rest of it. Ergonomics is a very personal thing. I like this smaller and lighter body and the ability to operate most of the buttons using only my right hand, while holding the lens with my left. IMHO, Canon should have put CF (or CF+SD) in 6D and dual CF in 5D3, but it's not as bad as CF+XQD in D4 .