6D is new, has better proccessor but for me 5D mk ii is best choice.
6D has smaller and lighter body so someting must be missed.
Are you serious?
If so, I have a 6-7 pound 1998 Dell laptop to sell you for the price of a current 2-3 pound model.
The 6D is an upgrade from the 5D2 in virtually every way, especially image quality.
6D has policarbon top cover, 5D has magnesium .
6D is new but flash syns is 180, 5D has 200
6D has a smaller sensor (a litle bit)
6D has smaller viewfinder coverage etc.
6D is new and chipper (than i have question marks:D
) , weight just was an example
The body can be made from titanium, or polycarbon.
Save your laptop for memories