I was just starting some experiments to see how developers affected Tri-X sharpness when this thread first appeared. I had not intended to include Agfa 12 or Agfa 14, but what the heck. These results are very preliminary, but they give some qualitative feel for the issue.
For this first try, I photographed a step tablet on a light table using Tri-X, Then I developed the sample rolls to about the same contrast in four different developers:
D-76(1+1) for 9.75 minutes (Massive Development Chart recommendation)
D-23 for 7.5 minutes (Massive Development Chart recommendation - pretty well matches the above)
Agfa 12 for 7 minutes (to match the above)
Agfa 14 for 8.5 minutes (to match the above).
I printed the best matched negatives at fairly high contrast and scanned them to get the results shown here.
The best overall quality and the best sharpness was shown by D-76 diluted 1+1. D-23 and Agfa 14 were very close, with Agfa 14 showing very slightly less graininess and very slightly more sharpness. Agfa 12 had the least graininess of the bunch, but sharpness was quite degraded. Agfa 12 and Agfa 14 seemed to give less film speed than D-76 or D-23. This surprised me, based on their compositions, and I will have to check it further. The development times found by experiment were a quite a bit less than what was recommended for the old Agfa films, so perhaps they give greater speed with more development and greater contrast.