Comparing J lounges, I sometimes prefer the QF lounge, as they actually have quite a good food selection and makes a difference from the usual CX offering. When the QF lounge isn't busy (ie no QF/BA flights), they will actually bring you food after ordering on a menu.
I went to the F Class lounge before and asked, but they said there is no menu and only what is on the Buffet. Definitely not as good as CX. But you are correct it is quite. Also they serve VCP Champagne and have a self serve HD Ice Cream drawer