Best doctors in China works at state owned hospitals. They may choose to retire or work part time at private hospitals
Private hospitals were mostly staffed by doctors from Eastern Europe and Iran, at least the one I went to (UFH in Lido, Beijing), lots of rich Chinese customers. It was comfortable and you just made an appointment on the phone. You got to wait in a nice waiting room with a plush couch rather than a concrete brutaleski waiting room with plastic chairs, private birthing rooms for babies rather than a community birthing room.