I flew on the 777 business class from Heathrow to Incheon a couple of weeks ago and it was OK, nothing special. I would suggest that, if the same seats are used on the A380, then it isn't worth the extra drag. It is different with airlines such as Emirates, where the difference in biz seats from 777 to A380 improves dramatically and you have access to a bar as well (possibly the case with KAL A380).