Nice shots, David.
I'm waffling between the 6D and the 5D MkIII. Some of my favorite shots from my looooong walk around London back in September were taken at a shutter speed of 1/6400s or 1/8000s. I'm wondering now if the 6D's 1/4000 limitation will make me regret buying it when I decide to use one of my fast primes outdoors.
I love the low light focusing ability of the 6D, but the high ISO noise performance is pretty much equal on the MkIII. I don't care about GPS and while the wifi would be cool to have, it' not a deal breaker for the MkIII. That price, though....