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The Wing's cabañas are fantastic: huge bathrooms with deckchairs, water features and a back-lit glass wall that feels like a large window (it's opaque, so any window feel is illusory). If you have an hour to kill and want to have a nice shower, the Wing is the place to go.
You can always try both, by the way. They'll let you into the Wing and the Pier on the same visit if your status is high enough.
From my experience the locals like rock hard beds and assume that everyone else does also.Probably my only gripe is that the "bed" and the deck chair are both hard leather. I'm not sure how hard people like their beds, but for me that was a bit too hard and not much better than sleeping on a hard floor. Laying down a towel and the bathrobe helps a bit.
simongr summed it up nicely.
My vote goes for the Wing (i.e. the lounge closest to immigration). Even if you can't access the F Lounge part of Wing, the views and ambience make it much more superior to the Pier.
Well, having popped into the Wing today to find the First class section absolutely brimming at the seams and a long queue for dining, I can understand NM's earlier comments about the viability of the QP/QF Flounge opposite G15 as an alternative to the Wing if boarding at a low numbered gate.
TR and pics to follow.