As always, when Im buying new gear, I dug a little further and found this nice forum of yesteryear around 1998-2002 with lots of Q and A on 67 lenses:
Lenses threads in Pentax 67 SLR
One thread about optical tests is especially interesting, names and dates of early articles on the 6X7 system in Modern Photography and some japanese photomags:
»I have copies of the Modern Photography lens tests cited above, as well as the reprint of the Asahi Camera report which appeared in Modern, in addition to Modern's and Popular Photography's own tests when the camera became available in the US. Anyone that would like copies of my copies can email me your address and I will send them to you. Bob
-- Bobby Mahaffey (mahajen@prodigy.net), August 15, 2001.«
More here:
Optical tests of Pentax67 optics
Is Bobby still around, perhaps here at PF, I wonder?
I know Steve Rasmussen is :-) Steve, would you know?
Regards Jakob