I have used my Mamiya 6 for traveling - usually with all three lenses. If I really want to travel light I have a little Fuji GS645s. The Mamiya 6 actually fills the same bag I used for a C330 with comparable (55, 80 or 105, 180) lens set. A little lighter, though.
I like RF cameras when I am in unfamiliar and busy places. Better general awareness. I prefer to compose on a camera screen, but it does not seem to make much difference to the final results.