I suspect if Execujet is still the same, which I believe they are............You will be the lowest paid pilots in HK. i used to be a Captain with them 8 years ago.
You will need to housing of about 20,000HK per month atleast. If you have school age kids, they will also have to pay for international schools too. If they don't, you will not be able to afford to be here. Schools are around 8000HK a month.
There are better corporate companies in HK who treat there staff the right way.And there all nice guys too.
Sadly, they do give the many great South Africans a bad name.
Good luck and be careful