I used all 1ds series Canon's for years, also 5D and 5D2, then bought a Nex5N, was wow'd by the sensor and got the A7r when it came out to get back to FF and up to much higher MP for large printing. Most of the lenses used on the Canon were adapted manual focus though; OM, Leica, Contax etc. The only Canon I used regularly was the 17mm TSE, sometimes the 85/1.2L I use all of these on my A7r together with the 24mm TSE II now. I don't have any use for AF though.