A few years ago a friend in Japan told me that the large camera shops in Hong Kong and Shanghai sent buyers to Tokyo. They would hit all the used shops and ask for all the mint f/1.2,f/1.4, Zeiss, Leica, and Nikon glass, and rare APO lenses to be boxed up and they gladly paid the asking price without asking for a single cent discount. This was all sent back to China where prices were 50-100%+ higher than Tokyo. I was told they cleaned out all the shops.
I don't know if it's true of not but it's just something I was told. Looking at prices on eBay, the camera shops in Hong Kong are always 100-300% higher than anyone else so it does make some sense.