I didn't post this little clip and my experience to be a pixel peeper and I added a "?" to the title. I think it is for everyone to decide wether he wants to spend $1000 more on a 5D M3.
I bought the 6D and I was fully aware of the test by Johnnie Behiri on Vimeo:https://vimeo.com/54352877
and I found it quite acceptable for me. At least for a $1000 difference in price. But what I saw back at home after my first shooting of a festival just made me fall of my chair. Please watch the roofs on my little clip - the are blue flickering "BLUE !" instead just plain red. Defocussing when everything is at infinity might be an option but honestly - not a very good one.
Second - I did post this here just to help everyone to make an informed buying decision as I believe a lot of people are very interested in this camera.
Maybe here is another interesting video to understand the differences:
Overall I really loved the 6D. Very solid build, good menus. Everything besides that moire and aliasing. I was really sad to let it go.