Picture from my mid-May flight after closed doors: http://imgur.com/a/8ikMP
I've been on a couple of intercontinental flights using Etihad, Swissair, Lufthanza and British Airways between Europe and Asia, most of which were not fully filled for the long legs between major hubs.
I've also seen a few full flights, so I guess it depends on luck and the seasons.
AT: CMN <-> BER, CMN <-> FRA
HV: AGA <-> AMS
KL: AMS -> CUR
AR: EZE -> MAD
I prefer to fly Tuesday, Wednesday or Thursday and unless it's some holiday coming up at the destination I usually have the whole row for myself.
IAH <-> LHR
IAH <-> DXB
DXB <-> PER
The way back was pretty full though (middle of Golden Week for Japan). I must have been pretty lucky for the trip there!