Well I mean, if you click on the cite note next to the data for the 777-9, it'll take you to a link to this website: https://leehamnews.c...whats-involved/, and if you scroll down, you'll find a table comparing the 779 to the A380, 77W and 748.
Granted, this article is from 2014, so data might not be entirely up-to-date, and although Leeham has been trustworthy (at least to me) before, I wouldn't be able to guarantee that the data is 100% correct.