Just to add to comments already made : of the three long haul sectors I flew in F last month, one of them was showing 6/14 (A380) and the other two (777) were showing either 2/8 or 1/8 right up until T-24.

The A380 ended up 12/14, and both the 777's went out full in F (in the case of one, across ALL cabins).

That's not to say it happens that way every time ; but I've long ago given up trying to second-guess actual take-off loads using either EF or even EK's own seats occupied map......