If you ever visit Hong Kong make sure to enjoy the culinary diversity the city provides.
My firs tips is to download the Open Rice App. Don`t spend all your time on HK Island and in Midlevels/Soho (even though that`s where all the restaurants are like in Europe - on street level).
HK has a lot more to provide.
The city has everything from huge budget food halls in Sham Shui Po, delicate but cheap restaurants and sky bars, to cat cafes on the 30th floor in Mong Kok. Open Rice lets you search for price range, location and cuisine, and provides intricate directives on how to get to the target restaurant (like exit on MTR, entrance door, which elevator, floor and so on).
The typical HK tea restaurants (cha chaan teng) which has affordable menues of canto-western food (HK/Chinese feat British cuisine), but not above average food. Here the great experience is to sit at a table with local strangers and eat quickly served food. It´s truly an experience.
If not the typical tea restaurants fit your taste, there are plenty of different restaurants. Tom Ho Wan (the one near Prince Edwards/Sham Sui Po is my favorite) serves Michelin stared Dim Sum, and is a keystone in HK restaurant sphere. Later during the night you can stop by one of the thousand street food stores and grab a HK waffle or some fried yummy.
If other Asian cuisines are preferred, there are plenty of them in HK. You`ll find Cambodian (with delicious curry), Thai and Vietnamese restaurants on many locations. If Korean BBQ is more of your taste HK has plenty of them. My favorite is OPPA in Mong Kok, great place. Once you get hooked on the social and delicious korean way to do bbq, you will always have a thing for Kimchi, salad and delicious Asian bbq sauce.