Well, how would one measure MTF in the case of T55? Seems to me the most honest way to do it would be to shoot a chart, pod-process the sheet and then take measurements off the cleared neg. Is that what they'd do? If so, then it seems to me that this could account for some deviations between T55 and panatomic x. I would expect pod processing to introduce a sort of Gaussian falloff in MTF simply because of the way the components mix and are distributed. Only the centermost regions of the film see truly optimal development, I'd suspect.
Make any sense?