I checked out the 6D with a 24-70 II, 70-200 II, and 200 f/2. It actually had a grip attached. Silent shutter is very nice and the camera/lens combination felt okay. They did have the shells of both the 5D3 and 6D and no comparison. The 5D3 and presumably 5D2 are tanks compared to the 6D. It seemed that the fps was noticably slower than my 5D2. I definitely think new 5D2's are better than the 6D unless you can't live without the GPS and wifi.