I looked at 5D, 5DII, D700.
I really wanted to like any one of them, but they fell short here and there (which camera doesn't?)
Ended up they never formed a better system for me except for the DOF for FOV thing.
5D - old, mostly 2nd hand, price of a new K5; poorer AF, DR, ISO than K5. Bigger too.
5DII - more expensive than K5; poorer DR, same or poorer AF, Bigger. At its price, probably more worth it to invest a bit more on better lenses for a more complete/utilized system than rely on old MF takumars, so ends up it would be more expensive than originally intended.
D700 - pretty good overall. Good AF, Good ISO performance. But a bit lacking in megapix at 12mp for my bad habit of cropping photos. Poorer DR too. Big of course. Re-investment in lenses.
Maybe this equation will shift again as their prices change with time and the FF itch bites harder, but for me, not at this moment.