You don’t need to leave digital. Keep it, it’s great for lots of things. Especially when you need to shoot lots without changing film, or when you need to see the results immediately. It's also a bit less grainy than film at higher ISO.
Film kicks ass in difficult light with extreme dyn range. A Bessa is a good tool, I have the R3A with 40/1.4 and 21/4. Focusing is not extremely easy, it’s something I have to learn. But it's a quite non-obtrusive camera, and man it's easy to use with long shutter speeds. I took a portrait of my dad just recently, indoors at dusk, with T-Max 100 and and the 40/1.4. Ended up at 1/4 sec. The shot is still totally OK. That would not work with my D70 or Olympus OM-1n. Too much vibrations from the mirror.
But still: the viewfinder on the OM-1n with a fast lens is very nice, possibly nicer than the Bessa R3A. Am I blasphemous now?
Summary: if you love the feel of film buy a film camera. An RF is a good choice, but it is a "nerd" camera, and it demands a lot of you. It's not as point and shoot as many SLRs.
On the other hand: with a Bessa you have a great way to get into the Leica M-system, with the most highly acclaimed lenses in the world. Andd if you can't get good results with that, it's not the equipment... (well, it rarely is...)