The official HIBOR rate is published daily by the HK Association of Banks.
The Hong Kong Association of Banks
er2, to answer your question, people dont get Prime loans anymore. The overwhelming majority of loans are now H based. But for the mainstream, they are quite a new concept. In fact, HSBC only started offering H loans earlier this year. Before that, you had to go to another bank and HSBC were losing a lot of market share. As soon as they started offering H loans, they became the No1 lender and H loans became the norm and not considered a risky or exotic product anymore.
With the cap, along with some banks allowing you to switch to P for free at anytime, there is absolutely no reason to get a P loan right now. The effective interest rates are less than half with the H loan.