Yes, this is an amazing universal player... have you auditioned this model?
I tested the SONY X-800M2 in my existing set up by replacing the Panasonic DMP-BDT360GA. Played the 4K disk on1080p display.
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4K from hard drive via DUNE 4K duo
Beauty and the Beast
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I have the same series model (x700) which has buit-in the same audio/video codecs.
only thing is that you have to use high end 4K HDMI cables, for best audio quality use separate HDMI for Audio to connect AVR.