FYI row 24 to 28 is premium economy. For any bulkhead row, I'm 5'10" and avoid the bulkhead rows for a long flight (fine for a few hours) as you can't stretch your legs out. I'd go for 48A or 35K (make sure you wear warm clothes and take a jumper) if you want off quickly. Upper deck economy disembarks behind J and W and (only) in DXB QF policy sees M2R door opened last after upper deck is mostly clear. If that policy is followed you could be off before economy even started disembarking. Re 80A/K (great window seats but can be a little noisy with the galley close by) you are also down the back of the aircraft where if the flight is not full, the bulk of empty rows will be. Best chance of scoring one. 71D is a good seat leg room wise but it's in the zone to be served last, so always the possibility you'll miss out on meal choice (shouldn't happen as a Platinum but depends on how switches on the crew is that day) but with first lounge access probably not that important anyway.