The Tokina 12-24mm lens is great for Hong Kong skyline photos – spectra shares a couple of examples, and said:
I have used the Tokina 12-24mm for a lot of my HK shots and it is a great lens for cityscape shots. I hardly ever use a 50mm prime in HK but the Tokina gets used all the time. Between 18-28mm is a good focal length for most shots but wider is sometimes needed.