I wasn't "perfectly" clear why I think Wolf is the "hardest" to play. All of the elite guitarists can play emotic and technical. What seperates Wolf from the others to me is how many notes in a solo he uses expression on, be it right handed (say a pinch harmonic) or left handed (like vibrato.) Wolf sticks with natural minor more often than not and doesn't really do any strange earth-shattering stuff like complicated appregios, but though I can play many of his solos "cleanly" I can't even dream about coming close to putting those extra touches of expression he puts in. Much of his work on the "Metal Heart" and Russian Roulette" releases is incredible. At first listen, his stuff doesn't jump out at you as being a cosmic revolution, but if you listen carefully to how well he constructs his solos and how much he puts into soooo many notes in that solo, he becomes pretty damned tough to duplicate. If there is anyone here that can play his better solos and match the expression he uses on all those notes, they are considerably more advanced than I am and I have been playing 20 years. Wolf is 'da bomb !!
Bryant