Update: just flew ATL to NRT on the 74S, it was as nice as advertised. I was in 77A, right behind the exit, which gave a nice ledge to rest some stuff (pillows, blanket) even though it said "no stowage".

1AK are probably the best seats for a couple due to proximity, every other seat is 100 percent private. Very nice little "booths" with back to the aisle, facing windows, all front facing (unlike 777 where seat back is to the window, and you face out to the row). I can't say much more, after lunch I slept flat for 10 hours uninterrupted, which says alot! I woke up as we landed and got a quick bowl of granola cereal. Very quiet, some seats were empty, I can't imagine that will happen very long, of course this plane could always be routed somewhere else soon, so I am glad I took it while I had the chance. Upstairs in BE in a 747 has been longtime goal of mine, and I became Diamond too on this flight as a bonus (no Porsche pickup though).