You are perfectly entitled to your view, but I have to disagree when you think think smog is the only view you get from the top of the mountain in HK! Plenty of HK hikers, local and expats alike, have gone out and enjoyed a hike in HK. Guess you simply don't hike enough in HK to know.
Enjoy your new life in Singapore. But just know its not necessarily paradise over there either. If you think there is no air pollution in Singapore, boy, are you in for a disappointment...