Some very sobering numbers: in the last three days, 927 patients in serious/critical conditions have recovered and 89 patients have died in China.
Assuming all people who died were in serious/critical conditions, we see a 89/1016=8.75% death rate for serious/critical cases (I know the average days to recovery and average days to death are different, so just a back of the envelope calculation).
This is really scary considering most of these closed cases were in Wuhan, the place with the most advanced capacity and experience for treating COVID-19. Remember Wuhan now has less than 1% of China's population but 10% of China's ICU personnel, and China's healthcare system was good to begin with. Also massive numbers of ventilators, negative pressure isolation rooms and ECMOs. Even with all these, Wuhan's death rate is still significantly higher than the rest of China. No healthcare system, no matter how supercharged it is, is a match for exponential growth.