SACD 2 channel vs Redbook 2 Channel

Here is what I found:
A well-engineered SACD sounds better than a well-engineered CD.
A well-engineered CD sounds better than a poorly engineered SACD.
A poorly engineered SACD sounds just as bad as a poorly engineered CD.
Percentagewise, 7 out of 10 SACDs I bought are well-engineered but only 1 out of 3 CDs are.