I'd say the Qantas Amex Ultimate Card is the obvious contender here, especially as Amex won't be hit by the RBA's interchange fee cap, so Qantas and Amex both have reasons to promote the uptake on this card.

Okay, I have to admit that is excellent reasoning! Choosing the aisle in the middle block of three seats is definitely playing to the odds that the other two seats will be occupied by a couple and the one in the middle will almost certainly go past their partner.. Very clever, I never thought of ...

With 2-4-2 there's no seat where you have aisle access and a good chance of no stranger climbing over you to get out.Not sure I follow you here, are you asking for solo seats by the window and a 1-4-1 layout? Because with a 2-3-2 or a 2-4-2 layout, the aisle seat in each of the '2's gives you ais...

Why do you think 2-4-2 is "an unattractive prospect for solo travellers"? A 2-4-2 layout is pretty much standard for premium economy on wider-body jets like the A350 and B777.

Ten-year old premium economy seat, upgrades to F&B are always welcome but SQ really needs to roll out a new premium economy seat alongside First and Business and add more pitch during the A350 refit. EK really has set the standard for premium economy now.