What about someone like Carlos Santana? At the beginning of his career he was playing a Gibson SG standard; then he signed a contract with Yamaha. Now I think that he is playing a Paul Reed Smith; but, from the very first note of a song, you can tell that's him playing!
And the same goes for a keyboard player like Joe Zawinul or Jan Hammer: they have no doubt their own style!
(or maybe it's just the so called "touch", I don't know...)