What do you consider a full endgame desktop setup and does it align with the R8's price point? Generally speaking, if you want to get the maximum out of a high-end desktop headphone, you need a high-end desktop setup. For IEMs, in my experience, the R8 should get most IEMs to their maximum without too much trouble. Less so with high-end headphones. While the R8 is excellent with the HD800 (balanced), driving it with authority, the HD800 will no doubt scale even higher with a high-end tube amp for example. Utopia should be easier to drive portably, so the R8 should do a stellar job with it, especially balanced, though I haven't personally heard the combination to say for sure.