Allow me to add a few more.
Beijing:
Atmosphere in the China World Summit Wing
The China Grille in the Park Hyatt
The rooftop of the Emperor Hotel, it's only ~5 floors above the ground (which is a good thing because there are no elevators), but the view is the best by far of these three
HK:
This is somewhat hard to judge because almost every 5-star hotel in HK has a bar on a high floor with stunning views. But, the LKF hotel, the Penn, and the Sheraton are my top 3, in spite of the fact that a very unpleasant food poisoning episode at the latter caused me to end my love affair with raw oysters.