Full service - yes, daytime flights will have a long lazy meal service with plenty to eat. Night flights will have a more rushed service (sometimes) and commonly no starter. The night times annoyingly "integrate" the drinks service with the meal service. Dont expect pyjamas on these regional flights.
I got PJs on QF62 BNE-NRT, as well as the overnight SIN-SYD. If it's overnight you'll be PJs