Well, think about that for a minute. Could the sound be "better" than a legitimate LP or CD? I think not. Whatever source the bootleggers used would not be as good as what A&M/PolyGram/Universal has already issued over the years. They, after all, have the original masters with which to make the legitimate media.
Nope, bootleg and/or counterfeit recordings could only at best be the same as a legitimate issue, usually worse. As a great example, look at all of the many issues of the HORIZON songs that have come out over the years in Europe and elsewhere. They are always reported as sounding muddy.