You may be lucky to find this or that piece of equipment in Hong Kong, but I would not count on real LF shopping experience here. There is no real variety and prices are quite high more often than not.
All addresses worth mentioning are in this thread already I guess. I suggest to walk down Stanley Street as well and that's all.
I am not that involved in HK LF life, but the few people I know buy from ebay and similar sources.
To give you an idea I saw 200mm Imagon on display for 1'800 USD (new though) and 4x5 film holders at 50 USD each (used!)
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