The CX J lounge has some Asian food available cooked to order, such as Bao buns and dumplings etc. Then there is a self serve buffet, which has selection of pastries and sweet things, some cold meats and cheeses, fruit salad etc, as well as some western hot breakfast items such as sausages, bacon, tomatoes and sautéed potatoes. It’s a small area, but actually quite a good selection of food.
Soft drinks and beer are self serve. For other alcohol then it’s a trip to the bar.

I wouldn’t rush to get to the lounge for breakfast, as there is nothing that you cannot get elsewhere etc, but it’s a perfectly pleasant free breakfast if you happen to be there, and in my opinion beats what is available in the Galleries lounge next door.