Long time no see!
If you are going to buy iPhone 4, these spreadsheets are very good for you to make decision to choose which Operator in HK.
Standard version
http://spreadsheets.google.com/pub?key=0Au_hDCvSI8ygdHctcDllWF9IbXJtZzFUcllrN3hlcFE&gid=0
Simplified version
http://spreadsheets.google.com/pub?key=0Agzdig0hVE2-dDhDWlVLSVpMeWgtTm1aa1dNZlowYUE
Comprehensive version
https://spreadsheets.google.com/ccc?key=0Alm1TMlDMkkWdGhaalhWV3dKVHZVSm9WTXU2b1lyRnc&hl=en&authkey=CMSqqLcB#gid=0