MTF Charts 17-35 and Zeiss 21mm.
Actually, for once (LOL), I'd agree with you.
But the reality is that nobody has run "with lens" (as opposed to theoretical) MTF charts (meaning, as you say, without body) on these two lenses at a full range of apertures (as opposed to just wide open), and thus, since the OP seems to be "objective test" obsessed, the best I feel he will be able to do is use the D3X based tests with the two lenses on various sites to get a feel for things.
(I also would say he's better served if he could rent the two)
|IMG_8168ABCD by citori525|
|McKinley meadow by TimR32225|
from Natural meadows
|Flare-well to a Classic Flying Machine by cjf2|
from Flying Machines
|_DSC2146 by jerste|
from Helios-44 II
|Leopoldsteinersee by RaCor|
from Landscape - Colour #3