Interesting tidbit: When talking about the oxygen mask, they specifically mentioned the addition of an "suffocation-prevention valve" which is the small black cylinder below the mic connector. They claimed that to be a unique invention not seen elsewhere.
It is great that they are paying attention to the smaller things as well. J-20 is a break from traditional Chinese fighter aircraft design in the sense that ergonomics was given heavy consideration. The pilots played a major role in the design of cockpit instrumentation.