I clearly stated that IF it is a separately mastered recording, then the SACD would be worth the investment. But anyone that has even lightly studied digital music understands that ANYTHING created for SACD can be replicated on regular CD. Only those who don't understand how sampling rates and bit depths work are dazzled by huckster numbers.
And for the record, I have several Mo-Fi releases, a couple of 20bit remasters, and some Blu-ray audio releases. All of them are wonderful. All but the Blu-ray are on CD, and the only reason the Blu-ray isn't is because of the surround channels added.
If it's a sound below 22.05kHz (higher than we can hear), or a change in amplitude under 96dB), it can be put on a CD. Period. It's simple science, not magic.
As Mike perfectly stated above (as did you in one of your examples), it's all in the (re-)mastering.