Having flown virtually all of them, I can tell you that hard product is more than just seat.
F on the A380, aside from being in the A380 with all its attendant benefits, e.g. smoother ride, has two massive lavatories that are glorious, has a humidifier, has lockers (making it very spacious), tail camera, and is on the upper deck. Additionally, the lavs are up front so no business pax are sneaking in there.
None of the above is true for A330 or A340, which are, actually the same.
The 744 has a seat and bed which is completely different.
And the 748 is in the nose of the plane, on the lower deck, very far from engines, has lockers and smaller lavs.