Well, I went DAP-crazy over the holidays and picked up the WM1AM2 along with the Astell&Kern SP2000T and A&K SR35 (for portable) use. Oh, I picked up a Fiio M11Plus too about a month earlier (I love different sound signatures).
The SP2000T is superb with its hybrid tube amp, but I think right now the Sony is winning out of them. There's just something about its slight warmth in sound that speaks to me, yet still possessing outstanding instrument separation, a good wide soundstage (depending on the IEMs or headphones used), visceral deep bass, and great clarity! I have it on the Vinyl (phono) setting and I am just lost in the music. I listen to mainly jazz, then classic R&B, classic rock, Gospel, blues, house, and neo-soul (very little classical and country). Oh, the high gain does indeed work on the American version of this Sony DAP. I still have more listening and burn-in to do before reporting back with more details.