I think we could say J-20 would be the most complex aerodynamic machine in all mass-produced aircraft, maybe just the most complex. It generates vortex like crazy, nose, inlet LERX, canard, main wind LERX, all those complex vortex flow combined, it can only be achieved by a country owns all types of wind tunnels and super-computers.
I'm not sure why we would want to make a statement like that honestly?, the J-20 is very aerodynamically complex with its distant coupled canards and elevons and ruddervators providing pitch forces, and no doubt the FCS is possibly the most complex, on the other hand it does presently lack OVT? so honestly, complexity is not always a virtue??
But to be very honest, I'm very, very impressed with the sound aerodynamics and novel approach to getting more pitch rate out of this airplane, Dr. Song and Yang Wei are no doubt proud, it works very well, flies very nicely, and maneuvers with no real apparent effort...
but, I mean it could well be true? and if Yang Wei's allusion to the J-20 already having an OVT demonstrator ready to go is correct, that my friend would no doubt be a very complex aircraft and FCS,, so you're probably right after all.....