Flying A350 from SFO-HKG. Is premium economy worth a few hundred dollar upgrade? Seat map on CX's website shows y+ grayed out but they are still selling upgrades, regular Y looks fairly empty. Anywho- are the views obscured in Y+ by the engine/wing? How is the noise level, as it appears to be really close to the engine. Would it still be louder in the back of the plane? Any thoughts would be appreciated.