Asoka
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The J-20's wing span serves better supersonic maneuver, which was purposely decided by the designer. The loss of lift from the relatively small wings, when in subsonic and transonic regimes, is being offset by the lift from the vortex generated by the leading edge root extensions (LERX) behind the canards. One of the design key point of the LERX shape and position is direct the left and right vortex to meet and join together above the fuselage and hence create a low air pressure area to lift up the fuselage further.
Typhoon is well known for its good supersonic maneuver even though it's still inferior to F-22 in regards to supersonic performance. But, same with canard delta configuration, J-20 is even further optimized for supersonic maneuver while trying to maintain acceptable subsonic and transonic performance.
J-20 don't have a small wing. It's wingspan is about the same as F-22's. And swept back at about the same angle to maximize supersonic performance.
At 6.63m (vs J-20's 13.47m) , the F-104 has ridiculously small wingspan and wind surface area. It is noted for ridiculous fast acceleration and dangerous tendency that killed many new pilots.
"The Lockheed F-104 Starfighter is a single-engine, supersonic interceptor aircraft which later ...... Crew: 1; Length: 54 ft 8 in (16.66 m); Wingspan: 21 ft 9 in (6.63 m); Height: 13 ft 6 in (4.11 m); Wing area: 196.1 sq ft (18.22 m2); Airfoil: Biconvex ..."