No airline used the top deck for a lounge after the SUD (stretched upper deck) was introduced. All of the non-SUD 747s have been scrapped by now. The original 747 had space for only 4 seats upstairs, thus the desire to use it as a lounge instead. I think one airline used it as crew quarters, not for pax use. This was before they got the crew quarters in the tail on the later 747 designs.