I would go with Canon's RF system strictly for the C70 and the awesome RF lenses dropping. That will be an amazing camera for everything you can do for the next 3-years. Also, I don't like Sony's image out of camera and it takes a lot of work to make it look as good as Canon's right out of the gate color and IQ - the FX9 image looks better, but everything else has an image that isn't nearly as good as Canon or Panasonic.
The Panasonic S5 and a couple of their f1.8 lenses coming out would also be a great, more affordable option.
