Hi,
Across in 35 MM is one of my favorite films. My testing shows it to be appreciably finer grained than Delta 100 but not nearly as fine as T Max 100.
What makes it so good is that its tonality is ( in my opinion) much nicer than T Max for most scenes.
I print 16X20 landscapes frequently, and while still using T Max 100 and sometimes Tech Pan, because of their amazing resolution and almost invisible grain, find that my batting average for overall print satisfaction for most scenes is best with Across.
Cheers,
Jay L.