Even though there is, of course, no best guitarist in the world. For me there are some prime examples of playing.

In terms of feel: Slash, incedible how he can bring emotions to his guitar.
In terms of technical style I wish to achieve: Marty Friedman, such an inspiring man!
In terms of total awesome fast rythm: James Hetfield, fastest downpicker in the world. If you don't know what I'm talking about here, just search for Fight Fire With Fire live in Mexico from 2009.