I flew ZRH-YUL on the new 777 a week ago in J and it was so fantastic. The J section was 1/2 full. F was totally empty so I went and took a peek. It looked incredible, the TV monitor at the seat was HUGE I think I read its the biggest of any plane, its a 32" LCD TV I believe. The seats looked noticeably roomier than my J seat too
I mean J was great enough but I would probably go for it, INTL F is always a great experience