For me it's the leg room, but the back is also a problem.
I resolved not to fly CX in Y any distance greater than HKG-SIN (~4hrs) unless the Y seats were changed. Their "shell" seating is terrible, as I found to my pain one overnight DXB-HKG flight. Ironically, the 777 regional seating (older style, with hard upper, soft lower) was far ore comfortable.
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