On Lufthansa you are guaranteed to starve; with Swiss can't be that bad.
Seriously, it's insulting how this airline can get away with such embarassing poor service in quality and quantity, yet to be regarded as a "premium" 5 stars.
A Premium Economy tray is now less than what was in Economy 15 years ago.
On a recent HKG-MUC my own snacks saved the day. Do yourself a favor OP and BYO food onboard.