Keith, in the case at hands I'm not concerned whether film resolution can be calculated into pixels, line pairs, signal to noise, or fluffy bunnies. It still misses the point that resolution is not everything.
People use to buy this lens or that lens because it resolved more, and this film or that film because it also resolved more. But in the end we're still buying blurry vintage prints for millions of dollars.
I find it fascinating up to a point how "sharpness" and all its corollary terms has been the holy grail of photography during the 20th century.
I think the (3) character option is a step in the right direction. It's one aspect that can make film a "killer app" in the changing photographic landscape of the 21st century.
Because in the end it's not about who has the longer d---, but how well our tools can serve us.