I have flown on Korean Air about 10 times over the past 6 years.
In my opinion they offer a very good product (very good service, very friendly flight attendants).
If you have a problem they really try to work it out with willingness.
For safety. In the end of the 90s they had some big accidents, but after that safety has been getting much better again and nowadays I would say they belong to the safest airlines again.
On long hauls (I have flown several times betw. Europe and ICN
) they offer 3 hot meals and can decide between two or 3 kinds of meal. And I would recommend the bulgogi as Korean Air offers best bulgogi in the sky (they already got award for that).
Hope it helped a little bit.