I visited a good friend today, and took my RPI2 with me. My friend has a high-end set-up very similar to mine (Quad Electrostatics, nCore power amps, MDAC, etc.), together with his new recent addition, his Auralic Aries Mini. We connected the Pi to the DAC via coax (Digi+ output) and the Aries Mini via USB.
I covered the DAC display so neither of us knew what was playing then we both played the same track on our respective equipment and swapped sources. The remote control cycles through the inputs so, after several quick presses, neither of us knew which was selected. Then we started listening.
The difference was clear. One was flatter and dull, the other had more life and vitality and a wider frequency response. "That'll be mine then", stated my host. I removed the DAC display cover and, to his surprise and my delight, the Pi was the selected source.
Take a bow, RuneAudio.