As long as Y & J is not overbooked you can expect to have a quiet cabin in F as EK is not low down any more in F as there are no more promo fares on offer ex ATH or LCA.
In all my F only flying with EK (6+) yrs on an average I have rarely seen more than 30% as an average revenue occupancy in F.
Remind u this is an AVERAGE % taken on the whole pattern on flying in F including majority of the sectors in MLH,LH & ULH.
2 give u something to look at: Had an EK 773-300ER in F on ULH with Total occupancy of 11Y, 2J,1F and this was in Dec 2009. Ghost Plane
Safe Flying
EGT