CX cheaper I class (Taiwan-USA) is only available for Taiwan departure. US departure only have J or C class.

CI's new F is identical to OZ's new F on 744. CI's A330 J (both long-haul and short-haul and only different in seat pitch and reclining) is also identical to OZ's J. Both new F/new J seat on CI and OZ are designed by the same manufacturer.

Regarding IFE, most of my friends say CI beats BR. I didn't fly BR before. I have no idea.