Guys, may I please request everyone, Chinese or Pakistani or anyone else, to stop arguing about whether J-20 would approved for Pakistan Air Force or not. None of us, be you Chinese, Pakistani, American, French or whatever, can say with certainty what China would do or what Pakistan should/would get. Be a bit more mature about this, who so ever tries to flame the argument that China would never let Pakistan have the J-20, is not worth responding to. The Sino-Pak friendship is not something anyone would understand other than Chinese and Pakistanis. Just let it be, and if this subject comes up again, then politely tell whoever raises the subject, to refrain from doing so.
Just for the record, China is not like America when it comes to it's allies, nor is Pakistan like Japam when it comes to procurement of military hardware. Equating or drawing similarities with these countries and their alliances is amateurish. For one thing, Pakistan didn't become China's friend, after being nuked by China. That's something to think about, when comparing alliances.