Food at the OZ J lounge is truly abysmal - I would recommend anyone hoping for any resemblance of a decent lounge food offering to either go to the Hub Lounge using Priority Pass, or go to the food court and just buy food instead.

F lounge is a little better but incomparably inferior to the F lounges of other major non-US airlines.

I remember when the Concourse A was first built, SQ already had to give up the existing SKL which was actually the best lounges at ICN. Now it seems they are losing it again due to the move back to the Main Terminal.