^ There's nothing to suggest J-20 and PAK FA won't come with integrated EW suites...?
And what kind of extensive EW suite does F-35 have which other modern aircraft doesn't? Barracuda sounds like just the same deal, only more sensitive and pilot friendly. RWR, IR, RF defences etc (ESM), no active EW like growler though you can argue its APG-81 can jam, but then again that's not saying other AESAs can't, especially larger element radars in larger nosecones. Being larger aircraft themselves, PAK FA and J-20 would have more space for avionics (along with other things like weapons, fuel etc).
Just for the record, word is that J-20 will have an EODAS system as well.
If we're judging the F-35, PAK FA and J-20 in terms of avionics (logically assuming all three would come with modern EW suites and EODAS) the T-50 is among the more unique, from its leading edge L band AESAs. But then again J-20 is an unknown factor.