SF is regarded as one of if not the best airline to work for in China amongst the locals.
The expats I have met there all seem very happy aswell.
They pay very well for hardly any hours and have a rock solid 2 weeks on 2 weeks off option.
Main downside being lots of night flying but you cant have it all I guess........
If you dont mind being away 2 weeks then definitely one of the better options available in China.
Cheers,