China`s J-20 is an expensive toy, very expensive indeed, at least it must be in the range of 100-80 million dollars. let us suppose the Chinese J-20 is 1/4 of the price of the F-22, the F-22 cost around 180 million dollars, so it will let the J-20 in 45 million of dollars, now think for a moment do you think it costs 45 million dollars?
let us see what the average chinese makes in a really good salary
a good minimun wage in China is around 238 dollars a month, see, how many people can live with a J-20?
see this report
see they say a chinese minimun wage is around 4 times cheaper than in the US
Now a realistic price for a J-20 is around 90-80 million dollars at the cheapest
See that the US has a military budget 5-6 times bigger than China, so when you see that you can understand that the J-20 is not a cheap toy, in fact 2 J-20s might be very expensive if you consider that the US population is 4 times smaller than the Chinese and its GDP per capita at least 6 times bigger.
Europe has a NATO a military budget similar to China`s, just consider that Italy, Germany, England and Spain make the Eurofighter and France Rafale.
If the Europeans making Rafale and Eurofighters have trouble making 300 jets and the US making 180 F-22s do you think that China will make J-20s like baked bread? be realistic, the J-20 is a expensive machine as expensive in social costs as F-22.