Marco1, I do wireless digital file playback via the OPPO 95. I find sound quality to be every bit as good as when playing the physical CD; however, the wireless connection does sometimes go south as Hgeifman says. Whether that is due to something inherent in my wireless signal or something inherent in the 95's networking implementation, I do not know.
Sorry to hijack, but please say more about how you get it to your 95 (I assume it's the same for the 105). I'm lucky enough to be hard-wired to the 'net, but I thought the only way to get high quality audio streamed to the Oppo was via the esata drive connection or a USB stick.