Skiidman, seems nobody has really approached the difference in CD reproduction which is the quality of mastering or remastering. Most pop groups couldn't care less about soundstage, imaging, full range and dynamics. The better quality CDs mention in previous postings have everything to do with production quality and control versus actual manufacture.
Labels are often an indication of quality as Windham Hill, Blue Note, Mercury, Shanachie to name but a few have taken time to actually produce a quality product throughout the entire process. Good luck.