Same helios 58 -44-2 on both cameras with that aperture ring that can be very precise.
Look at the colors of the paint below yellow one, compare M and 5D2.
I tried to be as similar as i possibly can but i noticed that green bias just recently, i also tested older ml builds and its the same.
Maybe there is more green photodiodes in 5D2 sensor thats causing this.Or there just isnt any standard that canon follows in their cameras so colors wont be accurate and they dont have to be ? Wheres color police ?

I will take regular RAW photo on 5D and compare that instead of MLV.
--
Just did that, its the same, same colors as in MLV file.
Anyway you can "solve" that in hsl panel in MLVApp, if you want to match 5D2 colors with real life.I just wanted to point out that its happening.
I wish someone would do that comparison with all canons side by side.