Hey you were at the ex1k thread as well! Hmm i used to buy into the myth that dac chips have sound sigs. I have burr browns, akm & ess. Hate to tell you that they dont and they aren't supposed to contrary to popular belief. Dac chips are just a component in the signal chain, have their specified function, and are not the final determinant in output sound sig. Of course I'm not an amp designer and my comments are highly disputable.
Paired them with ex600 and mdr-1r, sounds not too far off from my lg v20. Of course, ymmv
That depends, I certainly notice some minor sound difference between ES100 and A&K Jr.; but beside that, I'd take ES100 any day. ES100 makes it so convinient that I longer fret over expensive DAP anymore. There are probably differences in sound between DAPs but whether I can hear it is another story.
I'm always on the go so it would be a pain to keep manually update my music library if I use a DAP, on a phone it's so much easier. Although...I wouldn't object if they make an expensive version of ES100 (better DAC or build or buttons)