Exactly what is oversampling?

Had long term play demos at last club meeting between the Aero Capital and dCS Elgar and Purcell combo. dCS was more impressive. (and more money)

I recntly changed from a Bel Canto DAC 1.1 to a Muse Model 296 and though both are true 24 bit 96 kHz upsampling DACs they by no means sound the same the Bel canto sounded very good, but the Muse is truly amazing. In addition to the imaging, detail, lack of high end hash one has is any really good DAC there is a palpability to the instruments that I have only heard elsewhere with the dCS equipment. So to anwer your question there are definately differences even when the rate of upsampling is nominally the same.

I know that a $200 Pioneer dvd player is not going to blow an Audio Aero Capital cd player out of the water. I understand that quality high tolerance parts, massive power supplies, layout architecture, and build quality have an enormous effect on sound quality. What I am asking is this: are they doing basically the same thing? If the answer is "yes" then we should expect these relatively inexpensive "mid-fi" machines to come close to state of the art, cost no object players. Furthermore, if my assumption is correct then "upsampling" should drop drastically in price very soon. Shouldn't companies like Adcom, Denon, and others be soon introducing their afforable models in the $750-$1500 range that will be high class C and B to the Audio Aero and dCS units that we now have at very deluxe prices? Comments?