I too found that the Redbook layer of a Hybrid SACD is usually better than its regular CD equivalent (about 70% of the times). However, I would have to agree with Rcprince. Unless the original recording has been remastered for SACD production, chances are that the two CD versions are the same sonically.
I've owned some classical recordings that were produced and released on CD in early to mid-90's. When I played the Redbook layers on the Hybrid SACD's of these same (but remastered) recordings, I hear a noticeable difference, mainly a more balanced and focused sound. Could this be due to a better CD mastering process (XRCD comes to mind)? I don't know the answer...
I've owned some classical recordings that were produced and released on CD in early to mid-90's. When I played the Redbook layers on the Hybrid SACD's of these same (but remastered) recordings, I hear a noticeable difference, mainly a more balanced and focused sound. Could this be due to a better CD mastering process (XRCD comes to mind)? I don't know the answer...