I'm voting against the Mamiya 7. Its too big for the RF crowd and doesn't collapse. Focusing the long lenses is not very accurate. The 210 is a terrible lens, the close focus on the 150 is poor. The lenses aren't fast. The exposure compensation dial is not easy to use. Focus knobs too stiff for one finger movement. Worst lens caps I've ever used.
The Mamiya 7 might win for lightweight field camera, but exemplifying the coolness of a rangefinder it does not.