Having seen the seat reports for the above, just how bad is the lack of windows etc on this seat.... and are the toilet noises if you are in row 21 really that bad??
I have flown in 19A HKG-LHR and while I cannot remember if there is a window there or not, I would not put too high a price on it. There will be windows forwards and backwards of the row and you can easily look forwards and backwards while on the ground. After take off there isnt much too see anyway, and if the flight falls into 'sleep time' the smooth flat surface is much easier to prop a pillow up against than if there is a window there.
Remember you have V:Port to play with as well! You may not even notice the window