I really am interested in what the actual difference in density between longitudinal 2-4-2 and diagonal 1-2-1 is in real terms.
I'd be surprised if in an equal size cabin the 1-2-1 diagonal would lose more than 2 or 4 seats max (remember the Q-suite moving from 2-2-2 to 1-2-1 with zero seat losses); and pricing is market driven and I would think decoupled from cabin density to a pretty large degree.