mk, for obvious reasons.
DG, that tone, recognisable out of a gazillion other guitars..
Leo Kottke, the fingerpicking
The Edge, does have his own style as well, very recognisable
Satriani
JJ Cale is harder for me, i mean, i love the guy, and got all his cd's plus a very big lot of his live recordings, but to say his guitar tone itself is unique,...not really.