NOTE: In the interest of providing additional reviews on the UBK90... the following review was copied from another thread titled: LG unveils 2018 UHD Blu-ray players - UBK90/80.
Thanks to mike1sc for providing the following information:
"Ok, after having the UBK90 for almost a month, I have been happy with the overall performance, primarily now having a player that will correctly play 4K disks in Dolby Vision, which is the specific reason for purchasing it. The UBK90 is about 3 times more sensitive than the Samsung 8500, meaning a fingerprint or smudge on the play side of the disk will cause playback issues, so where the Samsung would play a smudged disk, I have found issues with three different disks, and after ejecting the disks and inspecting it, each one of them was dirty. A quick cleaning and the disks played as designed. I now know to insert clean disks into the UBK90. The other issue, and it is really not an issue, just a quirk, is the white screen that appears when a disk is stopped or removed. My first thought was that LG rushed this player to market. However, while I am not a fan of the white screen, I have gotten used to it. This player is not noisy. Overall, as stated earlier, I like this player, and I am glad to finally get a player that plays Dolby Vision."
LG OLED65B6P - Yamaha V867 - Roku Ultra - Chromecast Ultra - PC Gaming Console - Samsung DMP-BD85 - LG UBK90