MiG-29
Banned Idiot
First, J-20's wings have higher swap angle. It has less drag than F-22 when going straight (more drag when turning).
It has smaller vertical stabilizers (40% smaller). That's less drag and weight.
Based on public published papers by Chengdu designers, the delta/lifting body/canard configuration generates 80% more lift than delta only.
There is also unconfirmed rumor that J-20 has full control with the main wings only without canards. That means at high speed, it can use wing flaps to control, instead of canards.
So, while at a glance, J-22 has a large body. It comes down to whether the additional weight is canceled out by the much smaller vertical stabilizers. It may still be heavier, but I doubt the difference is that big. Remember J-8B (which does not use any modern materials) is 21m long, but only 9ton+ empty.
On lift, I am pretty sure J-22 has better lift than F-22.
On drag, I would call them even. Again, the additional drag created by longer body is canceled out by smaller vertical stabilizers.
a wing with more sweep will generate less drag at higher speed but will have less ability for AoA handling, the J-20 has smaller vertical dorsal stabilizers but it has two extra ventral fins thus increasing drag, by the position of the wing, the main landing gear is ahead of the main aerodynamic center, and center of lift, thus the center of gravity of the J-20 is quit ahead of the wing, as in the case of the AJ-37 the canard bears more weight and needs to generate more lift reducing its AoA and its deflection, the canard is a lifting canard in the J-20, all aircraft with canards can use flaps instead of canards for trimming, however the use of flaps or vertical tail for trimming means extra drag.
this configuration makes for a more stable aircraft which means a nose heavy aircraft.
The J-8II does not use internal weapons bays neither canted bodyside fuselage chines, stealth aircraft are heavier always than conventional aircraft, also one of the claims of the J-20 longer fuselage is to hold more weapons and fuel, so it is unlikely it is lighter than the F-22
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