I'm not aware of any current color film that gives nice grain, at least to my eye. There used to be an Agfachrome 1000 which was simply
wonderful, and a slow speed pre-E6 Agfachrome before that, avail even in sheet film, which was compelling, and I can think of a couple other
extinct species. Of course, antique Autochromes, with their dyed potato starch grain, can be quite lovely. Doing it digitally just seems to be
a wannabee approach, without the same finesse.