Buddy,
The loans are given out with a very similar rating to what is used in the US.
The first thing any credit officer would want to see is a stable income source and your ability to repay the loan. A stable income source can be a salary or your company's income (in which case your company can purchase the apartment and get a loan at a slightly higher commercial rate).
The next thing that the credit officer would want to see is your commitment to repay the loan. The last thing they want to do is loan you a fortune and you walk away from town leaving them with an apartment that may or may not be of any value to them.
By the way, is there a particular reason for wanting to be in HK? Where are you based out of now? I know a fair amount of people (From other webmaster forums etc) who have set up shop in Thailand. Thailand offers cheaper housing, cheaper food etc and fairly decent internet connectivity.
You don't really have to be in BKK, Phuket has great international connections and many pilots / bankers commute between Phuket and Hong Kong (fly back to Phuket over the weekend and live in a serviced apartment over the week). Just a thought..
Also, there is a flat up for rent in our classifieds, have you seen it? HK$5000 / month.