I got my Essence One Muses Edition back and yeah there's no question the dac is vastly superior to the one in the HDVD 800. I only got quick impressions before as I used it for a day before going back to the store with it. When I then used the HDVD 800 again for a week and now went back to the Essence One the upgrade in quality going to the Muses Edition was clear.
I'm really enjoying the combination of the Essence One as dac and HDVD 800 as amp. With the HD 800 it feels like the tone of the sound has been nudged in the right direction to make instruments sound completely natural, and if the recording is good enough vocalists just sound amazing. It's without a doubt the best I've ever heard the HD 800 sound in the now 3+ years I've had them. In the coming week I might be getting some more Muses01 op-amps, so it'll be interesting to hear if the Essence One sounds even better with all Muses01 in there.