This has turned out to be a wonderful discussion thread.
I've yet to fully master LF work in 4x5, but the biggest gain I've found is in tonal range and smoother micro-contrast. You won't see these in TMax unless you really work out your exposures & developing system. It's pretty easy to see in traditional films, though, such as AgfaPan, FP4+, HP5+, Tri-X. Get the Film Developing Cookbook (Troop & Anchell). It has a good discussion of film/developer combinations, and tells you why the TMax films don't deliver everything they seem to promise, and how to get the best out of them.
At 4x5, the grain won't appear that much better on the available traditional 4x5 films than with MF AgfaPan 25.
Bookmarks