These are always so unreliable because they never adequately account for the wide range of housing costs you can get in different cities when you take into account public transit as well as family size and whether you'll be willing to have roommates. You basically need to sub-divide and rank these across commute times + family/roommates preferences. So Top 10 most expensive within 10 minute commute, within 20 minute…
This, there is no possible way, when the housing cost of similar space and furnishing are included, that Hong Kong would be equal to Singapore and Paris.
Most of the figure tends to use 1 bedroom or 2 bedroom as calculation. You will then have to look at the bedroom in HK are very likely smaller than some of your kitchen in Paris.
And then it is further lowered by having the one of the cheapest McDonald in the world.