I do (as does my partner) this route on a regular basis and to be honest the last 5 flights from Dubai, the plane has changed every time.
Just last week checked at home and double checked at the desk in the lounge as to which plane was being used ( time of booking again a refurb 777, 3-class) got on and ...an old, very old 777. Not happy spoke to the chief purser, who said they are really fed up of business class passengers complaining about this, but Emirates are just not listening.
There is an Emirates lounge in KL, its of the older style but fine. Staff, like the rest of Emirates have gone down hill and really are disinterested to say the least, sometimes its play find the hidden staff in the kitchen. However the shower facilities are good and always clean and you don't have to wait. But you will have to hunt for the few power points if you want to use a laptop.
Dubai lounge, well hate the place with a passion every since it opened and prefer the old one (which you can use). Again they have sectioned parts off for refurbishment!!!. I had to stand in a 'q' for 10 mins not only to go to the toilet, but to use a grubby shower with only a trickle of water.
I'm really fed up to the back teeth with Emirates changing planes not only from Dubai but from other airports, and of course my seat along with it and the total sometimes inept attitude of cabin staff, who at times I could quite happily slap some customer service sense into them!!
Ok rant over, not for much longer by the end of the year I will have a choice of other airlines to choose from as I'm moving, so don't have to put up with this anymore.