People leaving? - yes, some are, not a lot - prob more to do so in the future. Why are they leaving? For a variaty of reasons of course. One reasons without doubt is the fact that CX is more checking than training - and yes CX is MORE checking than training compared to other airlines. Eg. the high number of failures during upgrades (the dudes have not gained enough positive training but rather negative "training" through checking) - sad, yes. CX would be such a better airline if they entered year 1980+ and changed the current philosophy, which simply does not belong in aviation.
Hong Kong, Polution, prob also a factor - though Im not personally to bugged about that.
So why are they staying? Pay is ok, but nothing out of the ordinary compared to the "national" carrier in Europe (prob also the US). Also a lot of the pilots in CX are from down under, where the pilotjobs are ****ty rewarded, and for them the CX deal is the best around (not a million miles from "home").
Anyways - dont leave (quit!) a fairly good job - but if not, definatly have a go here and judge it for yourself.
Best of luck
Y