I think the resolution depends on many things - screen size and viewing distance being both the same.

A crisper clearer image from a PJ is never a bad thing and for those with 4k PJ's and no HDR compatibility then it's not the end of the world to go in early.

The Panny UHD Bluray Player supposedly has

High Quality Sound

●TWIN HDMI PURE AV (Twin Isolated Output）
●7.1ch Analog Audio Output
●High-quality Audio Parts (Power Supply, Audio Circuit, Digital Circuit)
●High Clarity Sound Premium
●HDMI Low Clock Jitter Process
●Digital Tube Sound with Up-sampling
●High-resolution Audio Playback (DSD (2.8MHz/5.6MHz), ALAC, FLAC, WAV)
●192kHz/32bit DAC x 5
●192kHz/96kHz Surround Re-master

Does that mean a Torrodial based Power Supply - one can hope so

861v4 LPSU, HD621, Bryston 9BSST
KEF Reference 3 and 2c, 2 X SVS SB13 ULTRA
Audio PC: JPLay, LPSU, JCAT, PPA Studio
Cables XLO Limited, Unlimited Edition and Signature
Sony VW500 Isotek Titan, DIY Mains and Clean Signal Earth Solution