No! Don't walk into a branch. Apply on mobile app and get some freebies. Standard Chartered, Citibank. probably others allow you to open bank account in their mobile apps, take a selfie, take a photo of your HKID, write your signature down on a blank piece of paper and take a photo of that in the app too. All done without setting foot in a branch.
eg Citibank open a Citi Priority account on mobile device to get $3500 cash back, add a stock trading account and get another $500, apply for the credit card as well and get another $700 cashback.
Standard Chartered, I'm not bothered to search now but I think their basic banking plan is offering $800 cash back if you sign up before Sept 30th, then they offer an exta $200 (total $1000 cash back) if you apply via mobile app.
After you've got a basic setup, don't forget you'll need at least 6 different credit cards to enjoy all the cashback and point offers in HK, eg one that offers maximum points for overseas spending, supermarkets, dining, etc. I know if you are coming from NZ you are probably going to be overwhelmed by all the marketing bullshit that goes on HK, but sorry thats just the way it works here so make sure you get a wallet with plenty of credit card slots
https://www.citibank.com.hk/english/...id=C3PONP1B1X1