Interesting topic. I too was of the opinion that stereo SACD offered no advantage over well done red book CD. I actually sold several stereo SACDs because of this conclusion. Then I got the Oppo 205. As Ralph said, its SACD performance is superb...so much so that I now regret selling those SACDs. So perhaps the machine plays a significant role in the comparison.
It definitely does. You'll find further sonic benefits to the DSD 64 files from SACDs on a Digital to Analog Converter (DAC) like the exaSound e38 compared to an SACD player.
Not to mention recordings in DSD 128 and DSD 256.
More listening enjoyment - and sonic improvements - as the DAC improves.