I can tell you that there is no comparison between Digital and Vinyl or Tape. I would argue that I have the best front end possible, other than the new Taiko Olympus. I'm using the Taiko Extreme with XDMS, Router and Switch (and yes, each of these made a huge difference to the sound).
While I "only" have the HD DAC X, there is no comparison between digital and vinyl (Nagra REF TT/HD Phono) or tape (Metaxas Papillon).
Digital sounds great, don't get me wrong: it's clean, detailed, engaging; and if you don't listen to the analog sources, you would be happy. Analog provides the realism, tonal accuracy, and just a lifelike element that is missing with even the best digital tracks.
As one dealer put it when he heard my system: with digital it's as if the performers are rushing to finish so they can go home. With analog, they are pouring their heart and soul into each track.
Unfortunately, you have to spend a lot more to get world-class analog vs digital, and of course it's a lot less convenient.