So I downloaded the mrwalkman cfw.
And the player transformed from average to almost on the same level as M17 (in terms of sound quality not power obviously).
First of all I did side by side comparison with my cowon D3.
The sony sounded better. More musical and fun, bigger soundstage, punchier bass, less harsh treble, more natural and accurate mids and better detail in the sound.
The only thing that I wish sony had was the same amount of volume as on my cowon.
As for the m17, on paper it's not fair to compare between those 2 devices because m17 is much more expensive.
But some iems that I tried are actually sound better on the sony player.
And others sound much better on the M17.
here are the 3 devices side by side.
The M17 is a beast compare to the other 2.
But the difference in sound not as big as the difference in size.