Coming to think of it, 5D2 arriving at this price after four years is good news for a lot of people (especially those switching from rebel or those purchasing a DSLR for the first time).
It's a $2,500 camera with functions befitting its price range when first released; its capabilities have been tested for four years and still accomplishes the same thing today as it did four years ago.
How important is newer technology compared to a trustworthy gear?
Well, looks like I tied the score . Until we see some pics from an unbiased photographer shooting with a 6D, I don't think many would hazard a guess. I certainly would not... The safe answer is 5D2. My answer is save the cash for 5D3. But what do you shoot? What lenses do you have? Is your camera dying?