Faith is good, it drives the world we live in.
If we talk "Hi-End" 4K Blu-players, today only the Oppo 205 will fit the bill.
It is equally apt @ the audio side as it is on the video side. It's also a DAC, a headphone preamp, an analog audio component with XLR stereo jacks.
The next below hi-end 4K BR player is the 203, @ $549 list, and that price is always fixed, it never, never go on sale lower...unless a refurb for $439.
And of course private sales, but the Oppo players keep their value, so you won't find heavy discount on them, like say for half price. You got to be real lucky, once in a blue moon.
By the way the Sony X800 is $299 list, not $399.
And during the last Boxing Day period it was on sale for $149, and during the Holidays too.
Now it is between roughly $200 and $280.
For most mid-fi videophiles the Oppo 203 is the top best.
For most low budget people without a Dolby Vision TV the Sony X800 is the top choice.
Now, for support, reliability, service, warranty, etc., Oppo is unparalleled in the industry.
And the 203 is not without its issues here and there, no player is invincible all the way across the universe.
And the Sony X800 neither is the Queen of the galaxy.
* Last, scientifically speaking, video and audio measurements, you are going to find few reviews of the Oppo 203 with them, and none of the Sony X800.
If it means something today in the year 2018, only you can evaluate that meaning.
If you contemplate using your 4K BR player for say the next 3 or 5 years, which is a heck of a long time today, say 5 years...till year 2023, no one, and I mean nobody can tell you if your Oppo 203 or Sony 800 will still be functioning all the way properly in your own home, nobody.
There are no two people who use their machines the exact same as the next.
Faith is good, it drives the people in the world ...