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Not better colour... maybe better skin tones for some skin...
5DMK2 has a bit better colour, A7R isnt exactly amazing in this. A7 is ok, A7s is actually very nice (pretty similar to D810, maybe too much.. looks like same CFA and even same color profile).
With color profile, 5DMK2 has pretty colors, not 1Ds MK3 league, but then.. very few cameras can do that (A99 with good color profile or A900). And probably old Kodak.