Mike Ferris - Omaha, NE , May 18, 2007; 09:09 p.m.
Part of the depth you are looking for is called "Dynamic Range". Film has more dynamic range than digital. There are many actions, filters, and processes that can get close to a certain type of film reproduction...i.e slide film, kodachrome, etc.
I don't think I would be a qualified authority on this though, as I am strictly digital, and lack the ability to reference film comparisons. Someone will come along with some explanations though.