Ways in which you can tell if SQ 744's are configured with Sleeper Seats in First Class and new Ultimo Business Class seats.
1. By identification of the aircraft registration as mentioned by this post SMA,SMC,SME-SMH.
2. If you look at the number of windows between Door 1 and Door 2, if there are two windows starting from Door 1, this indicates that the aircraft has an old configuration whereas the newly reconfigured aircrafts do not feature the two windows from Door 1 as First Class toliets are located in this area now.