I noticed that some UHDs that I have, like Jurassic Park, do not have Dolby Vision, however, I can change the output on the x700 to Dolby Vision and it will play on my TV in that mode, even though the disc says it does not have DV. The cool part is that while watching the movie, if you press "Display" on the x700 remote, it will tell you if it is actually sending a DV signal or not in the top left. Even if the TV is saying it is playing something in DV, the info from the 700 tells the true tale.
When I put in a movie with Dolby Vision, like The Matrix, the "Display" button shows the movie is sending over a true DV signal as is signified on the screen when you press "Display". Just something kind of interesting I noticed, so that way you know if something really is in DV or not.
Also, on Jurassic Park, I noticed a slight difference in colors when I had the 700 set to DV even though the movie isn't DV. HDR10 mode looked a bit more saturated, maybe a bit more red. I don't know what putting the 700 output to DV is really doing to movies that aren't in it. I'm guessing I should just set DV to "Off" in the x700 menu when playing a movie that isn't in DV.