The question is not of one nationality but of all. You will go all out in defending Russian equipment even if it borders on the ridiculous as will those from India. Pakistanis will try to paint the JF-17 as the next best thing to happen after the Jet engine and the Chinese will try to defend their attempts to catch up to the world. But for those who actually love aviation.. and I mean aviation and not just loose babbles..they will see beyond these diatribes and focus on the facts.
Fact: Neither the T-50 nor the J-20 are ever going to match the F-22 for overall stealth simply because they lag behind in the field. Because of which both designs are looking to build their strengths in certain areas ahead of the F-22. The T-50 for eg is relying on being a better air combat fighter than the F-22 and try to get close enough to engage it. The J-20 is looking to simply scoot past the F-22 to get at the targets which are being defended.
Plausible Fact: There are ONLY 182 F-22s that are going to be out there and they cost a fortune to build, they also will not be used by anybody else other than the USAF. The exact costs of the T-50 and J-20 are still unknown but it is certain that there will be definitely more built of each than the F-22. They will however face a larger number of F-35s which rely on a balance of sensors and stealth; a balance that is superior to whatever the Russians or the Chinese will field. To this end the Chinese are ahead of the Russians in the hi-lo mix of 5th gen fighter programs but the Russians already have a proven platform in the Su-35 series to make life for the F-35 a little less easy.
The current Shaping on the J-20 or rather the stealth efforts are different to the T-50. The T-50 looks more to be a compromise for a low rcs in the front 200 sphere while the J-20 will probably present a lower frontal RCS than the T-50. In air combat, if high boresight missiles are taken out of the mix, both the T-50 and F-22 will eat the J-20 for lunch. However, the J-20 may have a high instantaneous turn rate courtesy of the delta and huge canards which will allow it to take its pot shots at either fighter should they face an encounter. Moreover, the J-20's recent reveal of the WVR aam missile bays seems to suggest a philosophy of relying on the missiles IR seeker knowing that it will not be able to get a radar lock on a stealth system. Which is why I further support the idea that the J-20 is not looking to engage either fighter in WVR unless it really has to. That doesn't mean it cant hold its own against a 4th gen aircraft like the F-16 and perhaps even match the F-35.. but essentially against the two purposefully designed air dominance fighters it will most likely lose if not for high boresight weapons.
Which brings us to sensors and electronics on the J-20 which re an unknown but with its huge nose it is likely it could hold an excellent long range and powerful AESA package(provided the reliability and sophistication of Chinese electronics manufacturing matches it) that would allow it to engage at fairly long ranges and(if the Chinese crack the LPI equation) be able to target and kill High Value assets like AWACS and ELINT assets without their escorts having time to react.
A lot of this game is about sensor and electronics sophistication; a field where as much as pride and nationalism hurts.. the Americans are far ahead.