I was on KA 482 to Taipei and it was three lines as well. One for Business/SL/GO/DM, one for club (this line was looooong) and one for economy.
Across the aisle was CX 464 also to Taipei. There, they had four lines. One for F/DM, one for J/SL/GO, one for W/GR and one for Y.
I'll see how it works out at TPE later today.