PAF does not operate any 5th gen platform yet. They would need to learn and develop concept of operations, techniques, tactics and procedures to fully exploit the primary and classified capabilities of 5th gen platform. (5th gen warfare is substantially different due to the nature of sensor fusion and networking it brings. No 4th gen fighters has those) That would take at minimum 5/6 years and would require at least a squadron of 12/16 jets. (4/6 won't be sufficient) After that you might be in a situation where you can assess what capability upgrade it needs to make it more effective. PLAAF already has nearly a decade of experience operating 5th gen platform with J-20. Running hundreds of simulation and real world wargaming exercises with so many different assets and types of networking.
As of now PLAAF is best suited for such job.