Originally Posted by fly747first

By virtue of a simple quantitative analysis, 1/4 is 25% while 3/8 is 37.5% and as you were told by LH cabin crew, LH F has been going on average with ~50% load factor, which is twice as much as JJ's 25%, so while there is clearly a lower global demand for F, passengers are unquestionably more likely to pay for this class-of-service on a carrier with a great F product like LH than on one with a so-so product like JJ.

Further, given that LH is making it very difficult to redeem F awards, its 50% load factor is being made up of primarily all revenue passengers, whereas JJ's lower load factor may consist primarily of F awards, e.g., my last CDG-GIG-EZE trip where I was on an award F ticket and I was the sole F pax on both legs. Same with my GRU-MIA flight last month (though I was in J in the row right behind the F cabin), I overheard the sole F pax on the flight telling the cabin crew how having a private cabin to himself was worth the many miles he had spent for the ticket.