>>3061768>Sony don't make m43 sensorsIMX269, and IMX159 are 4/3rd. The only problem is they haven't been updated for Exmor R, let alone Exmor RS.
But the thing is it actually just depend on how much money the camera makers funnel into Sony Semiconductors.
For example Phase One was satisfied with their niche they managed to make with that 100 MP MF sensor. So last year they ordered the design of a new 150 MP sensor with Backside illumination.
So this isn't exclusive technology, it's just about whether the camera makers want to put some money into the research and design, or whether they are mere window shoppers who just orders what is on the shelf.