Steve: That's a good question and I don't have a really good answer. The incremental extra resolution probably doesn't matter to me as much as low light performance. But then again, I have apparently been using my M9 in the worst mode for that (lossy compression), so what do I know? 🙂 Used M10R prices seem more or less the same as the M11 at this point. If I can get another three or four years out of the M9, perhaps those used prices will ooch down out of the stratosphere and I will make the judgment then.
Oh, that's drool-worthy to be sure. One thing not addressed in this thread (b/c really germane to my decision to repair the M9) is that I already have a Nikon D3, with a lot of AIS lenses, a Pentax K-1 with a lot of SMC-A lenses, and an OM-D whatevertheheck with a good selection of micro 4/3 lenses. I am pretty sure my jump to FF mirrorless is going to be Nikon-based at this point, although I am open to arguments why sticking with Leica makes more sense. For instance, it sounds like Leica has the coding worked out for use of their M lenses (even the wides) on the mirrorless body. That's definitely something to consider. I also have the core of my favorite focal lengths in R-glass, so maybe that will figure into the decision as well. All of that is in the future, however.