In November I did ICN-JFK with the beef bibimbap pre-ordered as I wanted to have ex-ICN bibimbap as sometimes it is not an option coming from ICN-USA as I've found out on previous trips in C. OZ's Korean food is world's better than KE's. Same with service and I find the OZ F seat has better padding than KE F.
Personally I thought it was some of the best bibimbap I've ever had.
Seatwise, 2K is fine.
OZ is definitely a better choice over KE.