Originally Posted by
ORDnHKG
No it is not, it is very common only where the mainland Chinese shoppers go to shop, shops in Causeway Bay, Tsim Sha Tsui, and Jordan, chain pharmacy like Watsons and Mannings, chain beauty shop like SaSa, jewelery shops, chain electronics store Broadway, some of the smaller pharmacy as well. (as mainlanders need to buy their baby formulas)
Mandarin is extremely common in business environments. More so than English nowadays. Just ride the elevators at the ICC, or IFC 1/2, and you'll see what I mean.