Have a search for some previous posts, especially about the Bugaboo, as there are very mixed feelings from users about its practicality in Hong Kong.
I do not have one, but the synopsis seems to be that the pros are that it is flexible and can be used as a travel system.
The cons are that it is cumbersome. If you did not have a car you would have trouble folding it up for a taxi each time.
Luckily as you already have one, why not give it a go first? I wanted one, but decided against it for the 'cons' reasons I listed above. Instead I bought a more compact travel system, which was the Quinny Zapp, which fits the Maxi Cosi capsule.
A baby bjorn is certainly the way to go with a new born, if you can, as there are endless steps in Hong Kong. I prefer to take the baby in the capsule when travelling by taxi though, which is why a travel system stroller was a must for me.
Legally you are not bound to use a restraint for your baby / children in Hong Kong though, and so many people swear by the cheap and compact umbrella strollers for ease of use.