jcs now I have the 5D3 and doing tests I can confirm you probably want to be using the following picture style (unless you are using a 3rd party one like CineStyle):
EDITED: This was the old Vince Laforet suggested setting, Neutral 0, -4, -2, 0, but now I've decided it's no longer best. Instead, I'm now suggesting another setting in my updated post below.
Reading Andrew's site, he's got factual errors in many of the articles I read. For instance, in his camera comparison as posted now, he dismisses the C300 has having only 4:2:0 color when in fact it has 4:2:2 as can be easily verified on Canon's site. Lazy for someone of that influence...this is why proper journals hire fact checkers.