[OstiaAntica]

Mandarin is not widely spoken in Hong Kong-- locals speak Cantonese and Mandarin was not taught in school while HK was under British rule.

[eru]

Yes, but lots of people speak Mandarin now, either for doing business with the PRC or because they are PRC immigrants.

[wavefunction]

Certainly I know this about Cantonese, but I'm just relating to you what I had read.