Thanks for comment. Just want to say that it is quite common that subject in landscape shooting is at infinity. My understanding is that a lens with field curvature will not focus correctly at infinity at centers and corners simultaneously.
You have posted some pretty impressive images from Hartblei cameras, high end backs and Canon wide angles.
My understanding is that the Hartblei lenses are Zeiss MF lenses. When I looked at the MTF curves of Hasselblad lenses I have not been that much impressed. Take the Macro Planar 120/4 for instance: http://www.zeissimages.com/mtf/cfi/Makro-Planar4_120mm_CFi_107884_e.pdf
, it doesn't seem to be very sharp off center, but I got the impression that it is a highly regarded lens.
A more typical lens may be the macro Planar 80/2: http://lenses.zeiss.com/content/dam/Photography/new/pdf/en/downloadcenter/contax_645/planar2_80mm_e.pdf
it has about 70% MTF at 20 lp/mm or lower on a large part of the field. But I got the impression that it is a pretty good lens.
One of the better lenses for DSLRs is the Sigma 70/2.8 DG Macro, that lens has around 85-90% MTF at 20 lp/mm over the entire field.
Neverheless, the Hartblei lenses seem to be very sharp according to Lloyd among others. What is your take and explanation?
Top Sigma 70/2.8 DG Macro at 20 lp/mm measured at Hasselblad
Center Planar 80/2.0 (Contax 645 mount)
Bottom Macro Planar 120/4 (hasselblad mount?)
Using a testtable of comparably small size to MTF superwideangles is a total misconception, if any informations shall be drawn from this, you would need to focus at least twice
maybe 3 times (center, medium range and corners), to compensate for the spherical sharpness plane of wideangles. This and only this would give informations about real imaging in 3 d objects/scenes.
The whole testing on websites and also at most standardization instances takes this wrong approach, a wideangle is not a repro lens, thus a flat field is not needed.
Photographers and people who refuse to believe blindly into these standard MTF results do testimages (Like diglloyd.com) and then tell what you can really do with this lens.