With regards to the A380 and it recent wing "rupture" during test, M. Garcia, V-P Engineering noted, "while the result means the wing doesn't have any extra performance margin, it also means it isn't carrying any unnecessary structure." (Aviation Week,Feb 20,06 pg 44)
Does that mean anything with regards to weight?? Maybe not, but Boeing's wings tend to have engines better distributed span-wise which they claim saves weight. I think the A340's wing is lighter than the A330's due to wing bending relief.
GF