you r absolutelly right about the performance at different apertures ,the pics that i v seen was :same subject from a tripod at f8,16 and i think 22 with both cameras ,same film etc.my friend wanted to do a test . at 16 and 22 was aboutt the same looking through a loop, at f8 we both thought that the kodak was better.
from what i hear the early models of monitors take the trimed 120 spools , the later dont.the hack im not really aware off.(sory about the spelling but english is my third language)