Even US aviation site assesses the J-20 as an effective threat to US navy ships and a leap forward for Chinese fighter jet technology
This large delta-wing canard aircraft is an impressive leap forward for chinese fighter jet technology. It might still be inferior to US jets in a dogfight,especially given known problems with its engines.
The J-20 aircraft was designed as a missile-launcher against U.S. aircraft carriers. In any other role it would prove inferior to even Western 4th gen fighters and their far more advanced electronics and weapons systems, however, it will still be a military game changer by effectively threatening US navy ships.