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.
Ironic you mention Ansel Adams who was the ultimate pixel peeper of his time and someone who spent countless hours doing special dark room processing and picking the right films and manipulating them in every possible effort to handle dynamic range better.
He was a total tech head and he spent endless hours in the wet lab.
He was the guy who questioned that sort of stuff MORE than perhaps anyone of his time.
He was an artist AND a tech head.