I was in the group that most DACs sounded the same until I bought a bunch of DACs and listened at home. The real differentiator of the sound was evident in my RAAL SR1a headphones. I never heard anything as revealing as the SR1a and with a bright DAC you get fatigue. With a to warm DAC you can immediately notice the loss of detail.
The very best DAC on the SR1a was the Musetec. No fatigue, no brightness, and tons of detail. On my 2-channel speakers, Thiel CS3.7 it is more forgiving with all of the DACs I listed, but still is the best sound with the 005.
I should clarify that all of the prior amps I have used with the SR1a have been solid state. Maybe 10 amps, 2 channel and dedicated headphone. A tube peramp or amp would alter my perception. As now with me using my brighter DAC3B with the new RAAL VM-1a tube headphone amp.