I can only comment for a young single person
50k usd a year is about $ 3,300 a month. I was on similar wages at some point.
Rent in a second tier city not really close to downtown was $900 for a small one bed. Food and beverage is about $20 - $40 a day depending on how much you go out , let's average it out at $30. Car , gas and insurance about $300. Cell phone TV internet about $150 . Miscellaneous (groceries , laundry, hydro , utilities ) another $350
Gives me savings of about $700, was usually far lower than that.
From a Google search and from friends and family that live in Hk .
Let's take a salary of net 100,000 HKD after taxes are paid
One bedroom in central or Kowloon side ?
Seeing anything between 17,000-30,000. Let's average at 25,000?
Daily food and beverages , let's assume 900 HKD a day ? Don't think people actually spend this much , especially if they are flying long haul .
Phone tv internet I read is quite cheap let's put it on the higher end 1000 per month ?
Utilities another 2000 per month ?
Transport another 3000?
Miscellaneous another 10,000?
That sums up to 68,000 , I'll round it up to 70,000hkd for your expenses .
Gives you 30k of savings which is $3,861 USD.
Am I missing something here ?