I believe they have AESA on some flankers and more of them in number.
Those AESAs (actually, some analysts still argue they are really PESAs) are in the same boat as everything else that's Chinese in this league...don't really know if they're good or if they just slapped a new array onto the same evolutionary development of N011 Bars that existed since 90s and calling it a new radar. I have little doubt that RBE-2AA is a better radar overall, even though Rafale nose is nowhere as big as Flanker's and there's far fewer of them. The planned Su-30MKI upgrade should incorporate a Tikhomirov AESA derived from Su-57's N036 Byelka - if/when that comes that'll very likely be better than J-20's radar actually (because again, Flanker nose is huuuge), let alone J-11B or J-10B/C.
Even if it doesn't for some reason, the consistently upgraded N011M Bars (went through three iterations since induction) on the MKIs is not a weak radar by any means. A healthy mix of MKI and its big *censored* PESA, Rafale with its AESA and Meteor, should be very much able to secure an upper hand in the air.
They also have MRBMs and IRBMs with manoeuvrable re-entry vehicles to wipe out your airfields or any SAMs that hang around in one place for more than 10 minutes.
So do we. Actually the Army has already inducted ~400 rounds (divided into 4 regiments if I remember correctly) of the ground-launched BrahMos Block-II/III with a reach of ~550km or above (we know the range restrictions have been lifted). And at least half of them are available for the Chinese front. Block-III was specifically developed for the Chinese.
Not to mention Nirbhay and the other systems set to come online in the next couple years.
S-400s shouldn't have a problem defending against short ranged BMs (if put to that role), although no one's saying they'll shoot down each and every missile China fires into our airspace. It won't...but neither will China shoot down all of ours. And there's actually far fewer targets we have to take out on the Chinese side to cripple the war effort. On the Indian side a LOT more facilities can help the effort, so more possible targets.
Long answer short...I don't see either side able to treat this conflict as a walk in the park.