China has surpassed the US in AEW&C in a totalistic comparison. In EW and ground observation stuff, the US is better in a totalistic sense but China has the local advantage. In tankers, it is still solid American advantage.
EW is by far the most secretly held content in modern warfare and when it comes to MIC.
I would assume that US and China are neck and neck when it comes to EW. China's software, communications and computing technologies are no worse than US and in fact can be considered a bit more comprehensively held under one roof (China) compared to the US where supply chains and technologies are a bit more spread out through East Asia and Europe along with the US.
Ground observation is pretty much US in lead in numbers and quality/capability. The utility of that relatively small lead isn't quite as great though, compared to something like say number of missiles you can produce. The granularity of Chinese ground observation space assets have matched the latest US ones in recent years but the numbers of the most modern analogs are behind the US. Sort of like saying China has far fewer 055s than the Burke flight IIs and up but we cant exactly say US destroyers are better. Overall the USN is more capable than PLAN as a unit like with the ground observation but trend wise, China is going to dominate in no time with the pace and rate. Next gen ones are just beyond the horizon and will be as quickly put into action as the current ones.
American advantage in western pacific is all but gone. They have allies though and a greater sense of confidence/arrogance which will give them higher morale until the ships start getting hit with Mach 10 warheads.
Note what some credible commenters from the Chinese side have been saying recently re YJ-20. Its footage are being shown only because it has long been a very typical mainstay anti-ship weapon, a reliable, resilient mainstay. The latest anti-ship technology that has been introduced is beyond the capability of YJ-20 equivalents (most likely HGVs and HCMs like YJ-17 and YJ-19) and the generation superseding those are in testing. We get hints and images of the latest in service weapons. Footage and greater visual material of mainstays (older ones were YJ-12, YJ-18, DF-21D). That's been the method for decades.
The US navy would have trouble dealing with PLAN armed only with YJ-12, YJ-18 and DF-21D. It'll likely lose a significant volume just against a 2000s PLAN. Against a 2020s PLAN, PLANAF, PLARF, and PLAAF, the USN in western Pacific stands zero chance of avoiding absolute and total annihilation. The US military leadership themselves admit to this.
We haven't even introduced DF-26, DF-27, YJ-20, YJ-17, YJ-19 and the PLAN surface combatant YJ-xx HG/CM which is a UVLS launched HCM or boost glider/cruise missile.
PLANAF just desperately needs to match the USN in stretching the operational sphere of its airborne wing to match all the PLARF and PLAN development. It needs another 5 super carriers.