I'm a guitar player. I can play decent jazz chord solos and do some single-line soloing around pretty conventional changes. I can comp well behind a soloist, but still, I'll never be a true, pure jazz guitarist, though. It's beyond my ability or beyond my commitment (probably both).
I studied at Berklee for 1 1/2 years in the late 1980s, and have studied jazz privately, and I have to say, knowing all your theory and chord scales and all the mechanics is a great feather in one's cap, but it doesn't come close to what one can learn by actually getting together with some other players and just going for it.
As I was reading the other posts in this thread, I noticed that no one here shares the same core influences with me. So, I'll just need to post at the risk of appearing trivial.
My main guitar background is really as a sound-painter. I enjoy playing some blues-based stuff and funk here and there, but what really thrills me are the sonic textures and atmospheres the guitar can create in rock/pop and minimalist formats. I know, this description provides easy armor for a player who sucks, and doesn't know what he/she is doing, but in my case, I'm proud of what I know, and all the jazz theory stuck in my head actually helps with what I do in a rock format---and without playing jazz. I love laying back with open-string arpeggios, upper-structure tensions on simple chords, treated capo, a boatload of effects, weird tunings, etc... To me, creating an atmosphere within a piece of music is as poignant and effective as soloing. Matter of fact, I recoil at the task of having to solo in a conventional way on music that I record or play with others. My soloing sounds stale to me, and therefore, I'm not very inspired to do it!
Some guitarists I admire:
Robert Fripp
Allan Holdsworth
Steve Hackett (1970s Genesis)
Pat Metheny
Andy Summers
David Torn
Kenny Burrell
Joe Pass
Emily Remler
Alex Lifeson (Rush)
Robben Ford
Martin Barre (Jethro Tull)
Adrian Belew
Dave Gregory (XTC)
Charlie Burchill (Simple Minds)