Very Very doubtful Fuji would use Sony or anyone else for their sensor(s). I was a long time EEE doing machine control & robotics high speed high accuracy vision system work. We partnered with Fuji. I can say their engineering and semiconductor (which is after all what our beloved ¨visible light translation ¨sensors are) manufacturing is the finest in the World. Yes, they are part of a partnership R&D project with Oly. just as much of the high resolution sensor tech. for weather satellite - solar corona research is in fact Fuji- Mitsubishi joint development. Ah, also in my past an aerial mapping photographer where Fuji did some wonderful camera-lens work as well as do very advanced SLAR, remote sensitometry, and magnetometer stuff. ;-)