For me, simply putting an 8x10 print from a 6x7 neg into someone's hands can clinch it. So few 4x6 and 5x7 prints are made now, much less 8x10s or larger, by digital p&s shooters. B&W prints, especially portraits, even OK quality commercial prints, cast a spell of their own. Some know it's "the film" that accounts for the look or realize, after being told, that there's indeed something different about the image of themselves, friends or family. Explaining that is what I try to do and it seems to work.