OK, 2 sides of the CD vs. hi-res digital formats "debate"...
From Doug Sclar, writing on the Steve Hoffman (audiophile) discussion forum:
"CD's just don't have the lower level detail that Hi-Res formats do, and the difference, once you learn to spot it, is not minor. The 24 bit discs, and downloads, just have a much more stable, detailed, three dimensional soundstage. If you learn to listen for the fullness and long decays of the reverbs, you should notice the difference immediately." (Oct 2011)
On the other hand, the *only* peer reviewed (?) scientific study, using double-blind (A/B/X) listening tests on around 550 occasions, concluded that the rate of correct:incorrect identification of when a hi-res (SACD.DVD-A) had a notionally "degrading", standard CD-quality encoder-decoder added to the circuit, and when it did not, was almost exactly the same as chance (50:50). In other words, in that study, no-one could consisttently distinguish the standard (16 bit), CD resolution version from its high resolution (24 bit) cousin. Copy available here: http://drewdaniels.com/audible.pdf
So you pay your money and you take your choice, I think.
Regards - Tony