I picked up a 6D originally as a camera for my wife, since it was a compact size and weight I thought she could handle it easily (she currently uses a 7D, the 6D is actually smaller). I also wanted to test it and see how I liked it as a 'second' camera to my 5D3. I must say, I like it a lot. I find I go to it often instead of the 5D3, it's very nimble and easy to handle. I just use the center focus sensor, and recompose when needed. I find that center sensor to be extremely reliable, and more sensitive in low light than the 5D3. The camera is a pleasure to use, not a replacement for the 5D3 obviously, but a nice and very usable camera. My biggest gripe with the camera would be it doesn't have dual card slots, I would prefer that.