Hello Again,
I just noticed now that you have a Roksan / Marantz combination.
Roksan had never sacd-ambitions (I think), and I think the amp can't decode "DSD", so it converts the DSD-files to PCM.
That IMO is the reason why you can't hear hardly any difference.
SACD should sound better in case of identical/superior mastering. You should hear at least some more depth in the music. A badly re-mastered sacd can off course sound worser than the original cd.
It's really childish that a bunch of non-believers always have to threadcrap on high-resolution audio.
When you ask what kind of system they have, it ain't dsd-compatible or they haven't changed the settings from pcm to direct stream digital (for Universal Disc Players like Oppo). So they can't hear (hardly) any difference ...
Myself, I'm having both the KI Pearl Amp + SACD/DAC and most of the time the sacd beats the cd-version. In case you want to compare cd/Sacd, don't try this with releases from major labels, but use recordings from audiophile labels like Analogue Productions who mostly use the same master for both redbook- and sacd-layer.
The Roksan-amp should be slightly better than the KI Pearl Lite amp (if you don't care about the dsd decoding). But how is the combination of both?
Marantz has a warm, smooth, analog sound. While the Roksan players in general are more "analytical players". Aren't they opposites? Off course, opposites attract from time to time.
It's on you to decide what your needs are. If you wanna go the sacd-route, you'll need an amp that decodes dsd (like the KI Pearl Lite amp).