In addition:
More space, better privacy, less people around you, less noise.
In my opinion CX has the best F product, esp. on the 777. JL is good. BA and QF is a bit dated.
As far as i know LAX-SCL is (unless you connect somewhere) LAN, they dont have F. The connection would be AA, which has the worst F product. Seats are ok, but everything else is not up to the standards of other airlines. EZE-MAD is Iberia, no F.