I'm not sure if this has been discussed before but I recently upgraded from Mark2 -> Mark3 and one thing that I noticed instantly was the improved colors/character in the RAW files compared to the Mark2. Not only do they look (according to my tase) more pleasing and vidid but the entire files seem more balanced and neutral yet punchy out of cam. It's almost like I don't need to color correct (which I ALWAYS need to do with the Mark2 files, even with accurate WB, there's a warm/reddish bias)
And when processing the Mark3 files further it only gets better. I'm not sure if this is thanks to a much better AWB or the new color filter, improved profiles or whatever. The last time I got this "feeling" straight out of cam was when shooting with the old classic 5D original - and that's a good sign! Of course, we are talking about subtle observations here but still to me very very noticeable - and I thought it would be fun to share and perhaps hear your opinions as well.
I admit the 5D3 files are fantastic. I went from 5Dc ------> 5D3 and it has a similar color tone. I still like the 5Dc a-little better but the 5D3 is close enough.