kwaigonegin
Colonel
J-20 is every bit about air superiority as F-22 is. If J-20 failed to be an air superiority fighter aircraft, it would fail its primary design goal. It's hard to imagine that China's primary future fighter aircraft was not designed to be involved in knife fight. In fact, It is specifically designed to be "competitive" against F-22. (Let's leave out how competitive it is or will be against F-22; that's different matter).
Now, due to its size, J-20 has longer range and large payload. This is a must for China's fifth-generation fighter aircraft operating in the vast Asia and West Pacific region. The recently disclosed high-level study document for China's fourth-generation (5th in today's terminology) dated back to 2003 stated that the new aircraft's combat range must be able to reach the capitals of most neighboring countries (~1,500 km). See the map below from the document. F-22, OTOH, was conceived during the Cold War, primarily for the European theater where NATO countries control a lot of airports and range was not hugely important.
So J-20 is also a multi-role fighter aircraft. It can fulfill both air superiority and strike missions.
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Not in my books. knife fight to me is WVR with guns blazing and SRAAMs. If the F22 or even the J20 ever gets in that sort of situation it loses much of it advantage as a 5th gen fighter.
Why bother investing billions$ in J20 if J10 can fulfill that role just as well?
Besides if J20 was primarily anticipated to be in close range knife fights most of the time then it would be a big error for the designers to NOT put mirrors on her which started this entire conversation in the first place!