Getting better, still not in our weight class. Note in the article this is presented as a pure domestic product, when actually it is final assembly of parts many key ones still supplied by Russia. Also note the comment in the article about the engine - Chinese has not yet fielded any modern jet engine produced domestically. This will be a first if it is. It is significant for that reason - it catches them up to Russian c 1980s or us c 1970s.
Most air forces: 95% hamburger, 5% dangerous.
US, NATO, Austrailia, Japan, and Israel are unusual, in that 80% and up are dangerous.
South Korea, Taiwan, and India are, in my uninformed estimation, in the second tier. Say 50% dangerous.
the rest: see first line.
North Vietnam had one fellow who was darned dangerous. The above isn't to say that those guys aren't there. It is to say that there are not very many of them.
And it takes a lot more time to get a trained air force than a trained pilot. Knowing how to use those pilots can only start after you have them.
In WWII it took 3 years for the US to figure out targeting. It took 7 years in Vietnam.