I have to disagree with the bibimbab being the same as economy, etc.
I do think the one in Y is miles better than any airline food I usually eat. The one in J is much more refined with actual big chunks of vegetable, meat, etc. and the soup is heavenly.
In F it's basically more food, sides, and more refined. I'd recommend taking the bibimbab out of JKF, and a Korean speciality (non-bibimbab) out of ICN.
