I've never flown KE in coach, but have in Biz and F. A very nice product overall. CI Y Is average, and J and F are ok, but a notch below KE, certainly. I fly CI F later this week, and would trade for KE F in a second.

I like the KE lounges in ICN, pretty comfortable, food catered by the Hyatt. I think Plats or better get to use the Biz lounge.