It seems like the new J5 is using a Sony sensor:
Quite incredibly, the DR is in the same ballpark as that of Canon FF DSLRs, but the other KPIs are of course lower.
. . . Combined with best in class AF, 20 fps and some of the unique lenses of the 1 system such as the 70-300, this is becoming a very appealing solution for some applications such as birding.
Whoever is making the sensor, it strengthens the case that those of us who like a highly portable kit that can handle wildlife and nature close-ups are ever better served by ILC sensors with relatively small pixels (2.4 micron) and thus by smaller formats. I am glad that Nikon finally added a "One System" lens longer than 100mm to exploit this use case. A macro lens would be a nice flow-up.