Ditto. I've got an M6 TTL (though I don't use the built in meter, in fact, I've never put the meter's battery in, I use an external incident meter since slide film is rathe unforgiving and ... I'm not very good) and I would never buy a digital Leica.
That being said, the Mamiya/Sony digital format rangefinder rumor [0] sounds interesting but what has really piqued my interest is David Hobby's [2] preview of the Fuji X100T's Classic Chrome (read: Kodachrome), Velvia and Provia modes [3]. If I go digital, that's probably the first camera I'd look at.
the built in meter is perfectly capable of metering accurately enough for slide film. If you're not sure what you're doing just set the iso to exp comp about negative half a stop to avoid (as with digital) blowing out the highlights.
the meter in the camera is obviously reflected light only, so adjust if you're shooting black horses or white dresses. Just use common sense and meter a stop either way to compensate for the deviation from 18% grey.
I know the built in reflective meter works, I think it's more of a case of I went on vacation and ruined a bunch of photos so until I get better at interpreting contrasty scenes with the built in meter, the incident meter will remain my crutch.
That being said, the Mamiya/Sony digital format rangefinder rumor [0] sounds interesting but what has really piqued my interest is David Hobby's [2] preview of the Fuji X100T's Classic Chrome (read: Kodachrome), Velvia and Provia modes [3]. If I go digital, that's probably the first camera I'd look at.
[0] http://petapixel.com/2014/09/30/rumor-sony-mamiya-release-me...
[2] https://en.wikipedia.org/wiki/David_Hobby
[3] http://petapixel.com/2014/09/10/classic-chrome-film-simulati...