Another vote for EK. Flew out to Singapore in J return earlier this year. Free chauffeur service regardless of fare code, spacious seats (albeit quite tacky looking cabin - so much bling!) amazing IFE and good food.
We even had a 6 hour layover in Dubai so that we went to have a few cocktails at the atmosphere bar on the 122nd floor of the burj Kalimantan. EK provided a free limo to and from the burj even though we were checked all the way through to Singapore.
If you go with EK, try and get the A380 out of LHR.