The airlines that chose the Thompson Aero Vantage with the single throne seat seating are much better than Gulf Air's 2-2 old-school feeling Collins Aerospace Diamond seats. There is some time for something to be custom designed or alternatives put on the market. The JetBlue Thompson Vantage Solo Mint suites are the best of the current choices.

The very unappealing Gulf Air 321LR seats, but none of their routes go beyond the UK or the Philippines so density I'm sure was the primary consideration.