Academically, I'll be honest, it is very rigorous, especially math courses. Most courses are graded on a curve, so just make sure to work hard from the beginning. Tutors are dedicated and after studying in 4 universities across 3 continents, I can assure you that HKU really stresses academics and there is high competition. People start camping out in the library from the first week 😑 not to scare you or anything, just that you will have to work hard for good GPA for masters.
Socially, tons of societies and clubs for you to join. of course HK itself is a great city to be in, be it culture, shopping, food, clubbing. Legal age is 18 so enjoy that. also, tons of business fairs and corporate events and the uni sends you daily mails for internships to bulk up your CVs. all in all, great opportunities if you take them up for it.
Religious views, don't worry about it. nothing of sorts. simply stereotypes. no one cares about that.
On the other hand, people have strong political views. (it could also be that politics was my minor). Young hongkongers feel strongly about their political standing and HK's standing. as well as politics in uni itself, especially related to SU. It doesn't cause any inconvenience whatsoever but you can enjoy that too if you wish.
Some extras - Extremely safe city to be in. You can walk around by yourself at 3 at night and no one is gonna bother you.
Objectively, perhaps the best commute system in the world. You wont believe the convenience and comfort of public transport.
Some really, really great hiking and running trails. As a runner, I was especially happy about that.
and of course, financial hub with awesome opportunities and great connection with other South-Asian countries. Go for a weekend, to Vietnam, Korea, Thailand, Japan and multiple other destinations. All in all, you will love the city
and lastly, if you havent got a chance to visit the uni, facilities are great too!