This is not comparable, but it is comparable in purchasing power.

The monthly salary of 15,000 in Hong Kong is a little higher than the average wage, but what about the average wage in the mainland cities of Beijing and Shanghai? Unlike 3,400, 15,000 in Hong Kong is almost equal to 4,500 in Beijing and Shanghai, but it can't be compared like this. Buying bananas and apples in Hong Kong is cheaper than Beijing and Shanghai, and buying LV is also cheaper than Beijing and Shanghai.

I hope I can help you.