I had both AK380+amp and DX200. After 200 hrs of burn in of the DX200 I literally sold my AK380+amp. If you are using Android OS or tidal or any player in the android OS, you are not fully utilizing the dx200. Please press and hold the power button for three seconds and switch to Mango OS. The difference between Mango OS and Android OS is surprisingly significant! The soundstage, imaging and power instantly enhanced by switching the OS. On Mango OS, the DX200 is absolutely comparable to AK380+amp. Both have excellent soundstage and imaging. The difference is that the DX200 is more dynamic while ak380 produces smoother sound. The difference is just on sound tuning but not on quality or ability. I end up selling my ak380+amp which I own and used for 3 months and I don't feel any degrading at all.
Comparing to the Sony Wm1z/a, the DX200 has better soundstage, imaging and analytical ability, while wm1z/a has better bass and warmer and more concentrated sound. Some may say DX200 is lack of bass but it's EQ can easily fulfill your bass needs. So if you are a Sony Fan or a super bass head or loving more intimate sound, then go for wm1z/a,but if you are looking for soundstage, imaging, analytical ability, transparency and clarity, DX200 is just a winner. DP-X1/a or fiio is just not at the same league.
At last, please don't waste the dap and start using Mango OS on dx200