The idea that China is ahead in Avionics has no proof and no evidence, Irbis is understimated because is PESA Radar, but
I am not underestimating China`s capabilities, but only telling you the same people who were saying the Su-35 had nothing to offer have been proven wrong.
China has AESA radars, but so does Russia, the difference is their military budget, China has been implementing their development of different priority programs, Russia has AESA radars on SAMs, the AESA Nebo radar coupled to the S-400 offers you a system that is much more effective than a J-10/J-11 and even Su-35, because the system use lower frequencies that make common stealth treatment iuseless and the detection and effective range of the SAM makes the AESA on a J-10 or the Speed of Su-35 less effective than the SAM system overall, that is why Russia sent S-400s to Syria and they did not send Su-35s