I’m finding the size difference of thew windows as depicted in that photo as being somewhat hard to believe.

Over active PR imagination perhaps? Surely theres not THAT much of a difference?

I dont have window size for the A330/340 jets but this diagram explains the size difference amongst the 777 , 787 and A350 –

So compared to the T7 the 787 windows are about 22% taller and 7% wider. The A350 windows are about 4.5% wider then the 787 windows but the 787 windows are 10+% taller then the A350 .

Some decent A340 window shots –

http://www.airliners.net/open.file/1233107/L/
http://www.airliners.net/open.file/1232623/L/