Originally Posted by clubeurope

Depends on your time of departure really.

Breakfast services tend to be just the normal breakfast options served in a single tray (bread, fruits, hot main, and yogurt) and a coffee/tea service afterwards.

Lunch and Dinner services tend to be more elaborate on >3 hour flights, with an appetiser/salad served separately from the main.

Given the food quality, at least on ex-Indonesia or ex-KL flights, I wouldn't consider upgrading to J unless if it was dirt cheap to do so, or if you want the extra space.