The biggest SAK has a reasonable set of pliers with a built-in wire clipper which will do strings (but not cello strings or fat b*****s like that). I prefer it to the Leatherman because the blades are less fiddly to get out.
The fish scaler works a treat - dealt dandily with some sardines at Sidmouth.
That said, the blades on the Leatherman are sharper and safer as they lock into position. Being a sucker for toys, I've got both. Sad sod that I am!