Alan, I'll post a few of my own curves below - they are consistent with the published data from Kodak and Ilford but might help with comparisons.
To answer your question, I would first say that
unless the scene has an extreme exposure range, TMX, TMY-2, FP4, HP5 and Delta 100 will all produce essentially the same tonality. I think it's important to make this point up front so that people don't obsess over inconsequential differences, especially in LF where other differences such as grain and sharpness are virtually meaningless barring gigantic prints.
Here are superimposed curves for TMX, FP4 and Delta 100, developed in XTOL:
Attachment 240470
TMY-2 differs somewhat from the others in the
extreme highlights, where it has more contrast rather than a gradual shoulder. Acros is similar but no longer available in sheet sizes. You can visualize this by superimposing TMX and TMY-2 curves:
Attachment 240471
It should be noted that the highlight contrast/shouldering behaviour of films like TMX, HP5 etc. can be altered somewhat by the developer type. For example, one reason Kodak released TMax developer was ostensibly to extend the contrast of TMX further up the curve. You can see this effect in Kodak's published curves for TMX where it has a longer, somewhat straighter curve when developed in TMax developer. Other developers that can be used for less gradual shouldering are things like HC-110 (or Ilford's equivalent) and Ilford PQ Universal.
TXP 320 is a little different than all of the above in that its "native" curve shape is somewhat upswept (slightly reduced contrast in dark areas/shadows, lots of contrast in midtones all the way up to extreme exposure levels). If you were to develop TMY-2 in one of the developers listed above such as HC-110, you'd get a little closer to the rendering of TXP 320, but I don't want to overemphasize these differences.
TXP 320 has more of the old style (significantly worse) reciprocity failure characteristics than TMY-2.
Incidentally one nice thing about the Ilford films is the much better reciprocity failure compensation information in Ilford's tech docs compared with what Kodak supplies. I badgered Ilford into doing this several years ago. Prior to that Ilford's tech docs showed the same generic reciprocity graph for all of its films. I like to periodically toot my horn on that one.
Hope this helps.
Bookmarks