Same here
I was earning a lot more in London and taking a 40% cut is something I of course preferred not to do, Having checked my expenses etc its roughly the same as my take home pay in London.
1. Less tax in HK
2. Transportation is much cheaper in HK, I'll be spending about $1500 a month on an oyster card in London, In HK I'm looking at nearer $500.
3. Lunch, $100 or so in London, $30 in HK
4. Also I'm supplementing my salary with a part time business thus can make up for the shortfall easily enough.
5. Courses are cheaper in HK too thus will take them and that will of course improve my salary in the long term.