SACD vs. Blu-Ray for audio quality/sonics

It is not clear that SACD sounds better than Redbook CD using identical masterings/recordings.  There was a meta-analysis of available studies done a few years ago, and the statistics done were weakly significant.

So, if your question is about the formats (i.e. bit rate & depth) then the answer may well be no.

If B-ray is PCM it may be using some sort of super long ladder resistive network to decode(?)  It is already difficult to use these for CD w/out having all sorts of problems, and many modern players convert to DSD for the decode.  Not to mention that many studios record in DSD to begin with....

So... the bottom line would be:
... don't worry about this while you buy better speakers and build a better listening room

willemj - I agree with #1

re #2 - IIRC, they selected only studies for meta-analysis where the redbook layer of an SACD was used.

In general, it seems wise for a consumer to choose SACDs as the mastering/recording will usually be done well and not "mastered for itunes) or some such.

Finally, I thought the major effect of using high sample rates was that you could avoid brickwall filters

do you know how  ESS chip in the Oppo 205 is implemented?