Not just F35, actually it will boost the sale of all 4th gen stealth planes...
For this J20 prototype, I'm more curious about the air combation ability based on the shape and size... I don't except it will be as "stealthier" as the other new designs but it "looks" like it's somewhat better than some current ones....
It is hard to say as it is anyones guess, in particular those Japanese and that Pinkov are not exactly accurate.
These so-called experts claimed that we should not have seen this plane until 2020, and yet we see it in 2010 now.