I don't own a Yaggy, but from all reports it is a well done Multibit, and to me should be discernable for the better over an Oppo DS using the same PCM source material, try feeding both a CD from a proper transport, maybe it the download junk that doing a great equalising job on both for you.
Is something from here download junk? I think not.
http://www.2l.no/hires/index.html
I can play the majority of those files from a USB flash drive connected to the Oppo. Pick one, please.
Then, let me know which one you picked, and at what time index within the track you exclaim "WOW, AHA, I GET IT, THIS SOUNDS SO MUCH BETTER THAN DELTA SIGMA BECAUSE..."