I strongly doubt it. Not all CD's are recorded by the same person to the same standar
Separation is something that is controlled in the mixing room. And, that generally refers to the left/right balance. I think you mean localization. Localization is quite an iffy thing, particularly when many instruments are involved. If you've ever been to a symphonic concert, you would notice that the sounds then to blend into an amorphous mass and localization is almost impossible, unless there's a solo.
BTW, this, too, is controllable in the mixing room as well.
Personally, think most of what ails you is on the disc.