I was doing some A/B testing with the Pontus and A8 tonight. My top two choices for brightness testing are anything from Miles Davis in the sixties and anything from Bob Dylan in the sixties or early seventies: Those high trumpet and harmonica notes get grating really fast on a bright system.
I was playing Carole King on the Pontus, and the soundstage for the vocals was so impressive - deep, three dimensional and slightly forward. One thing that caught my ear, though, was her voice sounded a bit thin at the top end, almost like the file was being stretched too far. Is it just me, or is that common on this kind of highly resolving DAC? It is an old recording, although I have a 192k version of the album.
Playing the same track on the A8, Carole King's voice didn't suffer from the same thinness, but neither did she have the stage presence of the Pontus. I feel like the A8 pushes the treble back and wide, so it is never really in your face. I guess that is why I can turn it up fairly loud and play it for hours. But you don't really get the oomph, that emotionality.
My $.02.