"Sony is making money off sensors. If they hold them back (for their own use), Nikon, Pentax, Fuji and others will leave them."
Maybe, but their tech might be so much more advanced than the competition the companies are at their mercy. Samsung, who appears to make a fabulous sensor in the NX1, is really the only competitor I see, perhaps toshiba or panasonic. And to comment on Samsung sensor manufacturing and Sony, Samsung still uses Sony sensors in their Galaxy s6 phone. As does Apple...
Which is another point, even if sony semi conductor stopped selling APS-C and FF sensors to other companies, they most likely will still be profitable as the majority of their revenue and profitability comes from mobile phones. So they could really care less about losing Nikon, Pentax, Olympus, Fuji. (possibly)
"I have heard about that great sony sensor for months now. Still don't know, what makes it that great."
If it is basically an APS-C version of the sensor in the A7rII, it will be awesome. -Back Side Illuminated
-Way faster read out
-Phase detect sensors over almost the entire sensor
"About the CFA: personally I'd like to know, who's manufacturing it. If you compare different color channels (of different cameras) they are significantly different - no chance all those come from the same manufacturer. "
They do, only so many companies in the world have the ability to make sensors. Kinda like Intel and AMD, not really any other major processor players. Now, what you overlay on top of the sensor (x-trans) and how you integrate that sensor into your camera, and what you do with the data it produces, and how you process that information, there is your variability. I imagine Fuji sends the color array to sony to lay over the sensor during manufacturing.
It is just really interesting, in the past few years the embargo was the other way around. Nikon would come out with their newest camera using the latest Sony sensor, and then a few months later, Sony would release their camera using the same sensor. Then they seemed to come out at the same time. Now sony is throwing their weight around... It seems.