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Is 40a/40c are good?
Yes although 40G would be my pick. I posted some photos somewhere in another thread.
41K has the crew rest in front so I would go for 40A. Pretty much the same as 40G but I'm an aisle guy (at least in Y).
Edit: Here's my earlier post with the photos. http://www.australianfrequentflyer....am/40d-744-qf11-syd-lax-25404.html#post356920