I flew this route last month in economy. Their seat pitch is great for coach (and I'm 6'1"). I didn't get the western meal, but they serve bibimbap for the Korean choice.
They only came around with a full beverage service before the first meal with all options (soda, wine, beer, spirits), after that it was mainly juice and water. However, feel free to ring the call button anytime and the FAs will be happy to bring you whatever soda or alcoholic beverage you want.
KE's AVOD will give you plenty of entertainment options, and there is a USB charger at every seat. You can check out their IFE magazine online:
http://beyond.koreanair.com. I think their IFE magazine also specifies the meal and beverage service times for flights.