Is it really important? It's an 8 hour flight, surely you can read, relax, sleep, chat, daydream, eat, or look out of the window.
I find it hard to believe that someone would choose an airline on the basis of the IFE, or worry about it, when this seems to so trivial. When I fly I hardly ever use the IFE, I find it hard to concentrate with all the movement around, the screens are too small to enjoy a film, even in the premium cabins, the sound is lousy and you have to put up with all the extraneous and ambient noise. Perhaps it's just me but I think IFE is a complete waste of time, and its importance totally exaggerated.