I doubt it, the F-22 was made using 90s era electronics and avionics while the J-20 is using state of the art Chinese electronics. Just think about how much the computers/electronics/IC industry has improved since the 90s. The only advantage is the engines. Regarding stealth, the J-20 has DSI while the F-22 does not, so it is anyone's guess as S10 said. However, the F-22 does have a key advantage in the tail aspect sector due to the superior rectangular nozzles over even serrated nozzles the J-20 (and the F-35) currently have.
It is more appropriate to compare the avionics, including radar, with the F-35 than the F-22. We don't know what extent the F-22 subsystems have been upgraded to.
Britain built the first steamship and train, but do you see it having any significant market share on shipbuilding and high speed train manufacturing today? Past history is a poor indicator of present performance. Unless you have classified information on RCS return on both aircraft, you're speculating based on existing assumptions that China is behind. It's called technology leapfrogging.
F-22 did not have good operational range either. This is absolutely crucial in the Pacific theatre, where the front is much wider than that in Europe. So the USAF was going to have to design a new fighter no matter what to confront China because the F-22 just does not have enough range.
Unless you can give us concrete evidence, saying you would put your money on X does not make your argument any more credible. Its just like saying how did the Chinese get their EM catapult to work when the USN has been plagued by its issues even though the US has almost seven more decades of experience in catapults than the US! The good thing about being the one who is catching up is progress tends to be much quicker than the leader in the field, which is indisputably the US with regards to avionics/radars. China already fielded its first AESA in 2002 or 2003 so in this regard it is not far at all behind the US.
I can upgrade a 1969 Shelby Mustang as much as I want, but it's not going to match the performance of 2020 GT500 Shelby. China has been releasing a new generation of avionics and radars every half a decade since 2000. Those aren't upgrades, but new products.
No I don't. But I think it is more accurate to compare the J-20 to the F-35 in these regards, whether it be RCS reduction, avionics, and radar. Please tell me why both the J-20 and F-35 have DSI while the F-22 does not? If you actually offered concrete evidence beyond the US has decades of experience in field A, B, or C, then you would be much more convincing. Under your assumption, something like a Chinese EM catapult would be impossible for another two decades because the US had started working on them a lot earlier than the Chinese (or hypersonics for another matter).
And I have already told you that Britain has been building trains and ships since the 18th century. That doesn't guarantee their current success (or lackoff).
From what sector? The F-35 has DSI while the F-22 does not, which would lend to better performance in frontal aspect returns. The F-22s advantage is in its rectangular nozzles, which is considerably better than even serrated axisymmetric nozzles.
As S10 mentioned, these are incremental upgrades, not evolutional or generation upgrades. The fact is its radar was designed in the 90s and uses technology of that area, with some minor improvements along the way.
