Thanks tons for that info. I've been absorbed with 35mm DSLR stuff so much I haven't been tracking developments in view camera lenses. I'm going to look into the 40mm HR Digaron-W. The 28 I have will do for now since I use it wide open with severe tilts for creative effect and only care that the subject center is crisp ... which it seems to do. I don't do much landscape work (if any) ... more environmental portrait stuff with some tilts, and studio product work which is why the 90 and 120 macro are so important.You are refering to the Apo Sironar Digital 2.8/28? This is the non HR version. And these lenses have much bigger image circles. The HR lenses have smaller image circles (though more as stated in the specs).
AFAIK it depends on the distinct lens - there are certainly Non-HR Rodenstock that perform very, very well even with the 6.8micron chip, especially longer lenses. The 35mm (non HR) I tested was very good at the center and actually for almost the entire image format of the P45. But with a few mm shift it was getting poor at the edges (very poor). Maybe it was a bad copy, too (but actually I don't think so as center was good).
Beside the fact that one or another non HR lens might be very well for your 39MP back from the specs there are the Digitars and the HRs for these highres chips. And the Digitars have bigger image circles as the HRs.
(The HRs were formerly named "Apo Sironar Digital HR" and now are named "HR Digaron-S" and "HR Digaron-W" - see: http://www.linos.com/pages/index.php?id=1933#c11391 ).
edit: found the specs of the non-HR and HR - unfortunately in German:
source: http://www.linos.com/pages/mediabase/original/d_Rodenstock_Digitalobj__3-26__8222.pdf
Thanks again for taking the time with an update and the links.
-Marc