You won't get much to be honest except for the good old SQ service and a pretty empty a/c with a 'fresh' crew that will do ZRH-MAN-ZRH and get off again. Going MAN-ZRH is a little better although the dinner service obviously only starts after ZRH and you'll get a sandwich/snack but unfortunately no Satays

.
Still, a nice way of using up segments/miles on a RTW ticket when you've got the rest of the day round Europe in the horrible cramped seating they laughably call C on 737's, A320's/321's and the odd jungle jet.
Not many intra-European flights done on a 744 !!