Ok,
You need to figure out where your domicile is before you can figure out where you are getting divorced. It isn't where you live, or where you work or where you were born or where you got married or where either of you filed for divorce first or where the kids were born. It is your domicile. The terms of separation in Hong Kong are different from Oz or plenty of other places so like I say, get domicile sorted first and if you both can't decide then the courts of the two countries you each went for for domicile will decide instead.
HOng Kong in relation to other places tends to be higher maintenance and "more even" asset split. Not always will 50-50 be seen as an even asset split when the court may actually look at all the factors and decide that 80-20 in her favour constitutes what is more accurate and fair. Duration of marriage determines how favourably the law looks upon assets you brought into the marriage remaining yours. They may say thet the sacrifices she made with having kids equal the sacrifices you made in relinquishing sole ownership of any assets.
If you can get it sorted out of court and possibly away from the lawyers (some or any of it) you save money. It's a catch 22, if you capitulate and don't argue over various assets you save money but you don't get the assets. It can end up being a sum zero game.
Importantly look after yourself. The last 10 years of statistics say you are 9 times more likely to commit suicide during divorce proceedings if you are male than if you are female.
If it's all getting too much and you need help then get it.