Originally Posted by Artmuzz
The A729 sounds a little more fuller in soundstage than the S639f but just a little. I find that the instrument separation is better on the A729 but again just a little. Both the A729 and S639F are great sounding DAPs. I think the later models like the A845 and S574 would sounded equally as good if it wasn't for that terrible EU volume cap which was put on all Sony DAPs after 2009. One thing I miss though is a virtualizer function like what found on Android music player apps. I feel the virtualizer function give more life and atmosphere to tracks but the Sony SQ is very good as it is anyway.
Thanks for the feedback - and congrats on picking up the A729. Enjoy!