Of course, it all depends on how small you want to go and what you are going to need the cameras for. This is why I have my FF (primary) kit, my M3 kit, G7XII and even the phone camera. Having the best camera system that you want to carry with you wherever you are going is a very nice convenience.

I have been impressed with the IQ coming from my M3, especially with the 11-22 mounted on it, but the other lenses aren't bad at all. I will say, I haven't like the flair when shooting into bright lights with some of the M lenses. But definitely capable of some excellent pictures.