Yes, the M9 is very versatile, and has its place even in the presence of the S2. I’ve also been using my M8, especially in high-IR environments.
I took only the M9 on a recent vacation trip… with less bulk, very easy to carry and pack. I had a UV/IR Cut filter on its 35 Summilux ASPH to suppress even more IR, and also to slightly cool the warm corners from the camera’s overcorrection.