777 has not got the raked type wing tips...... did you mean the 767-400 ?
Comparison.....777....
http://www.!!!!!!!!!!!!!!/open.file/354884/L/ (great picture by the way )
767-400....
http://www.!!!!!!!!!!!!!!/open.file/332347/M/
Boeings claim that the raked design has a lot of the benefits of winglets without the weight.......You make you own mind up.
