Just got the japanese version in black with the leather case yesterday. Very slick and premium finished device. The case protects the player perfectly.
Soundwise, both outputs deliver an impactful and detailed sound. Good soundstage as well. No harshness or sibilance at all, at least for me who is allergic to those sound characteristics. The device is just 10 hours old, so I'll need to switch headphones and IEMs before telling how it sounds compared to the 2nd DAP I own, a FiiO X5III + A5 combo. The Sony seems to be limited on power in comparison with high impedance gears, but it has enough guts to drive a large amount of headphones out there.
No problem as well the 128GB SD Card. This player is really portable and sounds really good so far. Finally, japanese language is not an obstacle, because the user manual in english is available (eBay seller sent it to me).