I have owned and extensively used Plaubel Makina 6x7, Mamiya 7, and Fuji 6x9; all with superb lenses. I have also used Pentax 6x7, Mamiya 6x9, Koni Omega 6x7, and two Fuji 6x4.5 rangefinder cameras [one a folding camera with built in light meter and with possibly a 70mm lens?]. Relative to the usual size for their format, the Mamiya 7 might offer you a good solution, but if you can work without interchanging lenses, 'folders' such as the the Plaubel Makina can offer great optics allied to amazing compactness [and flash synch at all shutter speeds].
30 years ago I worked with the folded Plaubel Makina on one shoulder and a tiny Olympus OM1 35mm on the other, and the Plaubel was the least intrusive of the cameras to carry [and I loved the metering in it]. The folding Fuji was a relatively tiny camera and the easiest camera to transport that I have used, though the advantage of 6x4.5 over 35mm is not as great as other 120 formats. Another consideration might be the recently released Voightlander 6x7 folding camera which is reminiscent of the Plaubel Makina.
I have [darkroom] printed thousands of Hasselblad images, but not once did I focus a Hasselblad image under a grain magnifyer and suspect that particular Hasselblad lens was the resolution equal my Plaubel Makina's custom Nikkor lens.
............... Chris