New Sony HAP-Z1ES Firmware Out Today

I installed the newest firmware today and was pleasantly surprised that the player now supports an external DAC via the USB connection. It now does DSD over USB2 and there is a provision to turn it on/off. I played a couple of different artists and the player seems to work perfectly with the iPad remote.  Here is the skinny, direct from Sony:

This firmware upgrade (version 18033R) provides the following improvements over version 17384R:

  • Adds support for the Media Server function
  • Adds support for the USB digital output function (USB hub support for connecting each of one HDD drive, one CD drive, and one USB DAC)
  • Adds support for Seek operations
  • Adds support for the Fade In/Out function
  • Adds the Go to genre/artist/album/folder function to the Options menu
  • Adds the following operations:
    • Queuing the track next to the one currently playing, and queuing the track last
    • Deleting the track from the play queue
    • Creating a playlist with the play queue
    • Deleting the playlist
    • Deleting the track from the playlist
    • Deleting the information of a disconnected external hard disk drive

I tried it with my Wyred4Sound DAC-2 with DSD and Femto Clock.  The dac cost me 1725.00.  The Sony bettered it in a way that the music really flows and  sounds more organic.  The Wyred dac uses the ESS 9018 dac chip.  Needless to say I sold the Wyred dac and bought a second HAPZ1ES player for my other system. 
I also enjoyed my HAP Z1ES, it is better than my "a bit old" sony XA9000ES SACD/CD player which was rated A+ by Stereophile few years ago.

Stereo5, may I know what interconnect cable are you using to connect your HAPZ1ES to your preamp/integrated amp?

i am using old audience 24es rca and I think it can be upgraded.
I use all Groneberg Quattro Reference interconnects and speaker cables.  My amp is internally wired with it.  The interconnects go for around 325.00 for a 1 meter pair with the WBT locking rca plugs.
Thanks to everyone for the various helpful info on this thread.  Found a Sony at ta good price, and I've now installed the HAP-Z1ES in my system and ripped a few hundred CDs to the internal hard drive.  Took a little while, but now it's done, and the table app makes navigation very easy.  Sound quality is pretty decent at this point, and the convenience is awesome compared to spinning single CDs.  Spotify Premium is integrated very nicely with the tablet app, thanks to the recent firmware update.  Is Tidal on the horizon?  Who knows, because how in the world does one get actual product information for this unit out of Sony?  Until it gets released as firmware, that is.

But I'm already thinking of upgrades.  Has anyone else tried an outboard DAC via USB to bypass the Sony DAC?  What are your results?  And is doing so better than starting with, say a 2K ModWright hot-rodding of the Sony?  
I just connected my Sony to an Auralic Vega.  I can't really hear much difference initially.  Need to do some more listening by switching back and forth.