I saw plenty of pics with 6D, but unless you like sorta "film-look" its not exactly accurate color camera. Tho with a lot of care it can produce ok colors. But its not 1Ds MK3 class or anywhere close..
Kodak SLR/n colors are like Leica DMR, minus 16-bit output and overall they are tiny bit weaker. Leica DMR looks bit like digital Ektachrome. Kodak looks hm.. dunno, interesting simply. Both very different from M9 (M9 is like Velvia I would say).