I just perused the Canon spec sheet for the 6D. I must admit, I am warming up to it. Initially, I didn't like the 1/180 sync speed. Ok, it is a bigger shutter on a consumer FF body. I am spoiled by my 60's 1/250, but HSS is available on EX flashes. I don't like no built-in flash commander, but I have 2 550EX units, both of which do 3 groups, compared to my 60D only doing 2 groups. I like the AUTO ISO settings; they are similar to the 5D3 with settable min, max, and minimum shutter speed. I also like the 2,3,5,7 shot bracketing capability. The 1/4000 bothers me a bit. And I still want to see how the AF systems works and how customizable it is. For $2000+ I want a bit of it, even though I use center-point only 90% of the time. It is still in contention for my upcoming FF upgrade.