I have a full review of Mojo vs Zx2 here. Each people hear it differently. Even now, Zx2 still keep on impressing me
http://www.head-fi.org/products/chord-mojo/reviews/14960
People had been mistaken that Sony stock player is the God and endgame because it was made by Sony....it is not. Sony ZX2 was made so friendly to 3rd party apps for this very reason. The preferences and the differences by using different playback apps
The one thing that DP-X1 is heavily lacking off, the friendliness toward 3rd party app
DP-X1 current UI, battery and unfriendly to third-party apps will disappoint you.