The MTF charts suggest that sharpness will be degraded by field curvature and astigmatism for the Hartblei 40/4 and 80/2.8, but not much by the 120/4.
This page explores that question with a resolution chart. Shot with the 24.4MP Nikon D3x and processed in Nikon Capture NX2 into 16-bit TIF (aberration correction disabled).
Because the Hartblei lenses are shift lenses (and tilt), the behavior will be explored here at full shift in the long direction, the most demanding case, but one which still allows us to see performance at center. Note that 10mm shift on a 36mm full-frame still shows 26mm of the unshifted frame. The image at page top shows the additional image area outlined in red, and the focus area near center of the frame outlined in red as well.
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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
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