For those Airbus and 777 crews who have never been exposed to these patterns, please take our word for it when we say they are incredibly fatiguing.
To drag the second crew, who operate the third sector, through 10 hours of PX prior to their operating the third sector (counted as the first sector as far as the FTL's were concerned) on a day that has you leave home first thing in the morning and arrive back home near midnight is brutal; and to do this several times in a month makes the cumulative fatigue even more difficult to cope with.
First crew should get off at the second stop and rest in a hotel. Second crew should PX on a pax aircraft to operate the third sector back to HKG.
Alternatively, pay us full credit as they are doing now, to dissuade them from rostering such fatiguing patterns.,