View: https://www.youtube.com/watch?v=wk03RJCTWq8
(I can't find the original source, but M7 made a video on it)
About J20, it's a decent LO Air superiority fighter, IG.
Size is Inconsequential if you can mask your radar return to the required extent, so is manoeuvrability.
In the case of a J20, it was designed to be a long-range sniper, and that's what it is. (Lack of Gun goes to show what Chinkis had in mind when creating it)
Canards of J20 make such an angle that it reflects the radar waves away, its belly is smoother than F-35, one could call its belly underwhelming compared to F-35.
Engines' nozzles are serrated to minimise radar returns, Canards are serrated(IIRC, not sure about canard serration)
Modern fighters can control the angle of their canards to reduce radar return
Though not as stealthy, it has the same order of RCS return as the F-35 at least in frontal aspect and has a larger(about 1800+ T/R module antenna) 3rd gen AESA(claimed by the Chinese) and should have a decent EW capability(there is no way that huge ass plane got no Integrated(Internal) EW suite/Active stealth capability
Introduction Previously, we have done HFSS simulation to evaluate the mean and median radar cross section as well as the radar scattering pattern of the four common stealth fighters namely F-35A, S…
basicsaboutaerodynamicsandavionics.wordpress.com
Also note that the median RCS is without RAM and all around, and not just frontal.
And the Newer J20 are coming in with WS-15 engines, can carry 6 PL-15 in IWB( Don't remember if it's with newer PL-15E missiles, if no, then this could go higher to 8 and goated side bay capable of carrying a total of 2WVR missiles