I was there 2 nights early April (upgraded to club room on 17F + executive lounge) and if you like live music, they turn some of the lounge space into a piano/singing corner on Fridays and Saturdays where you can make song requests or take the mic and sing alone the pianist. Quite fun!
But the lounge can't beat the free flow of champagne and oysters of Melbourne Sofitel!
Julien