Singapore Airlines is known for its top service and commitment to luxury. The lounge at Terminal 3 is massive. I'd estimate 200-300 seats with several buffets and bars.
There is hot food being served plus an enormous selection of appetizers. There is sushi, there are several different curries, delicious cheese selections, salads and more. There is a choice of several white and red wines and
Additionally the Internet is very fast even with all those passengers in the lounge typing away and watching Youtube.
The staff is extraordinarily friendly and empty glasses and tables are being cleaned away in minutes.
The interior design is impeccable and there are tons of electricity outlets as well.
I think for a 'Business Class' lounge the facility sets a high bar for any competitor. Doesn't get much better than this.