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1) The large size of J-20 will allow it to carry a powerful AESA radar. Such radar can easily detect 1m2 RCS target from 200 km. That means it will see 0.01 m2 stealth jet from over 60 km. Thats far far beyond the visual range (about 5 km).I don't think J-20 is designed to counter the F-22 because I doubt that the J-20 is as agile close up. From distance neither will fire because both are stealth.
2) Even within the visual range HMD + TVC short range missiles drastically reduce the importance of agility. Thats why F-35 has quite mediocre agility.
3) With powerful TVC engines J-20 may have an excellent agility. However I agree that stealth and large internal weapon bays were higher priority for J-20 designers than agility. Super maneuverability is good for air shows, but real wars are different.