On the F v. C seats thing, it's very subjective. I find I both sit and sleep better on the LH C seat - other will disagree. The LH F seat is nice enough, but I find it a bit lumpy at the joints for sleeping on - as I tend to sleep on my front. The problem with F is that once you go there, there's no going back... there was a thread about this recently.
I did FRA-MCO in LH C before Christmas, and found I spent the whole flight mentally pointing out the deficiencies in the C service compared to F!
