DYKWIA makes a very relevant point re the inter-cabin shuffling that goes on at the hands of load controllers (not least in the last couple of days & hours pre-departure).

I think it would be highly unusual if the two A380 flights were to go out with just one and three pax (in F) respectively. On several occasions over the years, I have seen indications of one sort or another that my own booked flights are virtually empty in F - only to find myself in a full or near-full cabin on the day itself !