I asked the question C70 vs R5/V+. Here are some stats --
The C70 with the EF-EOS R 0.71x adapter and recording media runs about $6550.
The R5 with the Ninja V+ and the AtomX Sync and recording media runs about $6000. Add about $200 if you want the basic EF-RF adapter. (for reference, the Z CAM E2-F8 runs about $6000)
Both systems have SMPTE timecode — the C70 uses standard BNC cables, the V+/AtomX Sync uses the Timecode Systems wireless protocol.
The C70 has better audio capabilities, which is helpful on ENG/EFP shoots & smaller productions but larger shows use timecode to sync to external audio recording anyway.
The C70 has built in ND filters, commonly used on ENG/EFP shoots but film style productions tend to use a matte box and filters in front of the lens.
The C70 outputs 4K from a Super 35mm sensor while the R5 outputs 8K from a full frame (36mm X 24mm) sensor.
I like the idea of 8K from a full frame sensor. It gives my cinematographer and VFX people more resolution/data to work with.
It stands to reason that Canon will produce a cinema series camera with FF 8K in the near future and it will be compatible with the Ninja V+ via SDI. The question becomes “at what price?”
It'll be interesting to see hands on comparisons.