I never thought that the difference is profound enough to actually make it any less comfortable, but after a recent international redeye flight in C, I've changed my mind!

The decresed width means that there is not much room for anything to go beside you, like empower charger, ipod, etc.

Also, the more annoying thing is that the seatbelt seems to be shorter. I guess this makes sense if the seat is narrower, but it makes sleeping on your side MUCH more difficult as you can't let the seatbelt out enough to get comfortable.

I know that if I have a choice, all my C class trips will be on the wider, much more comfortable C class cabins of the 747/777! ^