Steve E
989
Are you starting with a requirement that the new camera be a Leica, and then trying to figure out which one?
Just asking, because there is a huge photo world out there.
I think the Q (former owner here) is pretty fantastic for walking around, but somewhat handicapped by the fixed lens. As an only camera it has limitations. I sold mine.
And has been mentioned, rangefinders are more work to learn, and might seem novel at first, until you start missing autofocus, or wishing for sensor stabilization. Those factors coiuld discourage engagement.
Since the Q & M are quite expensive I'd try to test drive them as much as possible. Perhaps also include something like a Sony A7CR in the mix to see what else is possible in a compact high res, form factor.