London L,
I think you have to look at the "total tax" take on an income of 200K. The "income tax" might be lower than elsewhere but in Singapore you are (invisibly) taxed in many other ways from gasoline at the pump, to GST on every purchase to the +++ mentality here and especially on cars, duty, etc etc. So, as expats, many of these high taxing things are taken care of by having a free car, free housing, free school fees, etc and some "beneficial value" is ascribed to these benefits and taxed on top of income tax at marginal rates (some expats have "tax paid salaries").
HK is a better (lower taxed) environment for working professionals in this regard.
FYI