I recently concluded my short Seoul getaway. I bought the tickets in September when MAS had a promotion at $1068 (incl. tax) for Business Class (which was a great price). During the October promotion, the price went down further to $1018, otherwise the normal price was about $1900-2000. 2016 is the year MAS introduced the new J seats progressively and I managed to catch the new seats just in time as the changeover for Seoul happened on 31 October.
Despite the excellent price, there were a few disadvantages of this flight. Firstly, the KUL transit. This can be mitigated either by taking an 830pm flight to KUL (leaving just slightly less than 2 hours of transit time) or one can opt for a morning flight and spend half a day in Kuala Lumpur instead. The flight time between Kuala Lumpur and Seoul is about 6.5 hours, leaving you barely any time for nap (especially with the meal service factored in). Lastly, the return flight from Seoul is 11am, hence one full day is wasted. If you are willing to compromise on these, MH J at this price is definitely a steal!