Sony has updated its sensor page and shared the details of lots of new image detectors it's created. Sure enough, a few of them bear a striking resemblance to sensors inside other manufacturers .
One detector in particular, that a 26-megapixel backside-illuminated (BSI) APS-C chip with merchandise code IMX571, bears an uncanny similarity to the detector utilized indoors Fujifilm's X-T3 camera. While Fujifilm has not verified it has a Sony sensor in the X-T3, General Manager of Fujifilm UK, Theo Georgiades, did state it wasn't a Samsung sensor used within the camera, as some thought to be the case, leaving no doubt that it was Sony who fabricated the sensor. The specs listed below this picture sensor on Sony's website all but affirm that speculation.
Additionally, it is worth noting that there's a great chance we will see Sony build something about this sensor also. Even the a6300 along with a6500 both probably use the identical sensor as Fujifilm's X-T2, therefore it's not a stretch to imagine Sony will soon be releasing one or two A6000-series cameras employing the 26-megapixel BSI picture sensor found within the X-T3.
The BSI IMX461 detector was in the works for quite a lengthy time and according to Fujifilm's statement that it is currently creating a 100-megapixel medium format camera, it is likely this is the detector that is going to be inside of it. The sensor has 3.76 micron pixels and has a maximum frame-rate of up to six frames each second.
The IMX299 is a bit more difficult to hit on the head, but based on it being 11-megapixls, having 4.63 micron pixels, along with also a 60 frames per second readout, it's almost surely the sensor found within the Panasonic GH5S.
This 20-megapixel Four Thirds-type sensor has 3.3 micron pixels and a maximum readout of 60 frames per second. This has been supported by TechInsights to function as sensor inside the Panasonic GH5.