The Private Room is much better than the CX F lounges but the CX business lounges are much better than the SQ Biz Lounge, not to mention the lame Kris Flyer Gold lounges. I think that overall SQ has the best business class experience in Asia and the world although I find the seat on MU and CX better than the SQ seat. Premium economy is better on CX than SQ. First class is a toss up between the 2. I also had a surprisingly wonderful FC experience on CA earlier this year. Others are definitely catching up (or SQ is dropping down), but SQ is still very good.