Hong Kong is one of the most densely populated cities on the Earth and that's probably why it's so photogenic! So much is happening everywhere with the metropolitan crammed into what seems like a few compact square miles.
I would bet the place would be a photographers dream! Tokyo & New York I feel are similarly photogenic in that respect.
Probably why I find the dispersed and desolate landscape of my current city Sydney Australia so boring and dull!
Definitely a city to visit for wandering photographers..