Comparing the formats being discussed, after conversion to jpgs in the 2000x3000 size range
35mm film: Ricoh KR-5 : Fuji Xtra 400 iso
lens Rikenon XR 1:1.4 50mm
Shop processed and scanned in Australia to 2941 x 1960 1.6MB jpg
https://app.box.com/s/kt1c0gkclvdggkmziqh6
Pentax K-01 raw file converted to 3200 x 2121 4.0 MB jpg,
lens 18~55 at 55mm and f/5.6 and auto focussed on the boat at mid distance
https://app.box.com/s/oxag3uddabbcm3fpvl16
6x7: Fuji pro 400H home developed, scanned on Epson V600, crop 3284 x x2189 5.7 MB jpg,
lens Takumar 6x7 90mm ls at f/16
https://app.box.com/s/qvgti2pqt49awrv0fump
Perhaps the fidelity is a bit down to the nut behind the viewfinder.
When I view all of these on the 22 inch (1920 pix) Eizo, they are all OK at full screen.
When I zoom up toward 100% ( 100% would be a 33 inch wide image, the resolution on all starts to go south, the one that falls first is the 35mm slr.
The K-01 and the 6x7 have roughly similar resolution falloff.
I am getting prints for the 6x7 made by Office Depot, so far up to 14 inch wide. They are rather good.