I put this together six years ago but the figures still hold true. If anything they underestimate the cost of living in HK today. These figures were based on a husband and wife only, no kids with the wife not working. If you have kids, especially of school age, you might find yourself in deep financial trouble moving to HK.
HK$ (/mth).....
Tax 7,200
Rent 15,000
Utils 2,500
Car
Trans 1,200
Food 6,500
School
Clothes
Ent 3,500
Misc 4,500
Total 40,400