For what it's worth, I flew Asiana to Seoul last year in Economy (booked through Qantas) and was pleasantly surprised. Good service, nice food, legroom comparable or better than QF (as far as I could tell). Not sure about in-flight entertainment as I always bring my own. Of course, not too long thereafter the Asiana flight crashed at LAX due to pilot error, which put a retroactive dampener on my favourable impression.
MASA - marginal Any Seat Award - a way of buying Any Seat Awards (which earn points and status credits, unlike classic awards) at a redemption rate comparable to the classic award, plus a cash co-payment. Normally Any Seat Awards have a dramatically higher redemption rate than classic awards.
WP - Platinum tier status member. The W stands for "wanker". (Seriously!)