Very interesting - tried pricing a few trips Germany-Dubai or Germany-Australia.... pretty decent deals in Y and J...
but then if you have 2 adults + 1 infant (baby) in J they will charge the FULL adult fare for the baby without a seat (no taxes added) whereas in Y and F it's the usual 10% of the fare with no taxes. That spoils the deal and makes it worse than the standard J fares.
P.S.: don't start me on the "babies don't belong in Business-debate, ours has so far been very well behaved, sleeping well, loving to fly and the "Secret Star of the Bar" on the A380