Yes, some are happy at CX, but over 90% of them are in their first year with the Company. They haven't yet figured out that being a long haul seat warmer, literally, doesn't have anything to do with being a pilot.
Your pilot skills will get worse, not better, until you are a JFO.
Your health will get worse, not better, as you breathe horribly polluted air and have massively disrupted sleep patterns from getting the bad rest periods.
Your bank account will be empty, not full, as you struggle to have any semblance of a decent life style in Hong Kong - one of the world's most expensive cities.
Your hopes and dreams will be shattered, not fulfilled, as you come to realize you can't support a family well in Hong Kong and you will NEVER get a base in your home country.
You will probably never have a car in Hong Kong. You will be relegated to buses and trains for the rest of your CX career.
You will live in a region that is slowly, day by day, becoming more and more like mainland China. Do you want to live and work there? If not, think about it.
The food in Hong Kong is either horrible quality or extremely expensive. Which do you think you will be eating?
Every time you want a drink of water, you will have to purchase a water bottle. No sticking your head under the sink here.
CX has so little pride that its aircraft are maintained at the lowest levels allowed. If everything works, you will at a minimum fly in a very dirty cockpit. Except for the passenger cabin, these aircraft are cleaned very infrequently. Check out the paint next time you see a CX plane. Clean or dirty?
You will work for managers that despise you. Not only do they not like you, they are vitriolic in their disdain for "overpaid and coddled pilots". The irony being that you are massively underpaid given the cost of living in Hong Kong. The only coddling you will get is when you fly to places where they still respect pilots. Hong Kong and CX is most definitely not one of those places.
Truly, I could go on...