I've been impressed by availability for SQ first as well - looking at SYD-SIN vv in April and SYD-SIN-HKG at Easter, there was a surprising level of availability in SQ first. Problem is, there only ever seemed to be 1 seat available on each flight (fair enough I suppose) so if you don't want to be enjoying those luxuries on your own, one of you might just have to be *paying* for a ticket.