No other manufacturer offers anything like that for a 35 mm SLR. Of course, the R9 by itself costs about $3200 USD (no lens—those cost thousands too, and I don't think any are autofocus), with the 10-megapixel Modul R back running another $6000 (!) or so. That's even crazier than the latest Nikon and Canon DSLR beasts.
But you know, it is Leica. If I had $9000+—USD—okay, with lenses, probably $12,000 just to get started—to spend on a DSLR (and I sure don't), I might consider the R9 Modul R over the Canon 1-Ds Mark III, just for the pure snob factor—and the much cooler name.
UPDATE: Here is the Leica M8, a more traditional rangefinder-style Leica, now in digital form, which I would very much like to try, though probably not own, someday:
It's quite controversial and very pricey ($5000 USD, no lens), but has great value for some people. For some it might even keep them alive (or at least get better candid photos) because it is much less obtrusive than an SLR.