I am from Germany and I already hat my half an hour with the 6D.
Placing it side by side with a 5D3 and 5D2 it is noticeable smaller and both of the 5D had better ergonomics.
Mostly it comes from the total lac of buttons on the left screenside and the missing multicontroller.
The mode-dial without an endposition is also not really nice ( hard too use in darkness).
Also handholding an 400mm 2,8 was more comfortable on the 5D "and soo much more on the 1DX "
Beside from that it is a nice camera and it would not really be easy to chose between 6D and 5D2.
If someone want some more impressions on the 6D just ask