The quality of international school education is good, and easily beats the UK or USA, and is probably on a par with Canada.
Many of the schools are now doing international Bacculaureat programmes and the ESF in Shatin has some of the highest intl bac results in the world.
The decision to come to HK is a personal one.
Bear in mind:
the weak USD
the horrible air quality
the fact that your wife probably wont be able to work
before you decide.