>I've done a full time start up with a day job, quite literally coding every waking hour of my life(like 2 - 4 hours sleep a day) for years
I am much more productive coding than 99% of the people around me. One of my secrets is I sleep well. Probably your definition of coding is different from mine because of your working area. People make stupid mistakes when they are sleepy, including me, and it is way more expensive to fix(finding bugs in a big codebase) than not making then in the first place.
I have met lots of Chinese people working and had the opposite experience. China is so big that outliers that represent one in a thousand are more common but most people are that, average at most, way worse than European trained workers.
The fact that they sleep on their shops and workshops does not make them super human. Quite the opposite, they are human and working more hours make them work less intense.
I don't believe the Story that Chinese can run at Marathon pace all day, because they are similar mental limits for humans as they are physical ones. And Chinese people get burnout like everybody else or worse. Apathy on workers is the normal state.