That won't be much of an upgrade over the 5D2, Save alittle more for a 5D3.
That's what I'm looking for: Is the move from a 5DII to a 6D an upgrade or not? Or in my case, do you save the money on getting the once raved about proven performer or go with the new?
Yes, it is an upgrade. In this chart (The-Digital-Picture) you can see the 6D improvements over the 5D mkII in red. Do those improvements justify the move? only you can decide.