I shot a Stouffer Transmission Wedge (13.2 stops DR total) with a 5DII, 5DIII, & a D7000.
The 5DIII required 1/3EV less exposure than 5DII to keep any channel (meaning: green, since that blows first) from blowing out in the brightest patch of the wedge. The D7000 needed 2/3EV less exposure than 5DII (i.e. 1/3EV less exposure than 5DIII) to keep any channel from blowing out.
Well, I'm sure this ensures you pick the right camera for all those NatGeo contest winning Stouffer Transmission Wedge pictures everybody is clamoring for!! Call the NY times!! Wedge pictures here, get yer wedge pictures here!!
God pixel peepers are a joke. Ansel Adams surely never questioned this type of crap.