In continuation from my posting above- I just got back my T400CN photos. They're very sharp, minimal grain (but only 3x5 prints). They do seem somewhat sharper than XP2 although I haven't compared them side by side.(posted 9166 days ago)There also seems to be a bit more latitude with T400CN than with TMX400, but again this was not a formal test, just my qualitative observations. I've been using a mechanical camera for years and rely on a bit of latitude.
At first glance, I think this (T400CN) is a great C41 B&W film.
Asher