Pray tell me which Chinese plane could compete with Su-35 in aerodynamic performance ?
You are reversing the burden of proof here. You were the one making the claim, not I, so it is you who needs to back up your claims, not for me to counter a claim I consider to be without solid foundation in the first place.
J-11 is a Flanker with weaker engines without TWC .
The J11 is also lighter (how much so is hard to say since varying sources disagree, but they all agree it is considerably lighter than the Su35), with significant internal changes over the baseline Flanker design.
J-10 is delta wing configuration with single engine .
And this automatically makes its aerodynamic performance so much worse it cannot even compete? Says who?
J-20 is still in prototype stage, again with weaker engines .
Again, what do we know of the J20's aerodynamic performance, even with sub-optimal engines, to be able to tell one way or the other?
Finally, no Chinese plane ever demonstrated abilities of Su-35 in public .
Neither have other planes, and their pilots have gone on record as stating their planes could do what the Su35 did with its display, but that they would not pull such risky manoeuvres at such low altitude just to put on a good show.
Most western combat pilots are also highly dubious of the tactical relevance of a lot of the tricks Russian Flankers are famous for performing at air shows.
Thus not being able to put on the same air show display is no indication on who will emerge victorious in a real fight.
To make an determination of aerodynamic performance in real combat scenarios, you will need very detailed and comprehensive performance figures to make comparisons, and no one but the Chinese military have those.