Hello jafreeman,
I own an Oppo 105 player that has performed great for my system's 1080p video needs and for excellent performance on audio discs. It also serves as an excellent 5.1 surround sound processor with its analog unbalanced rca outputs (up to 7.1) that I connect directly to multiple amps in my system. I believe your Oppo 95 is very similar to the 105 in its combination of excellent video and audio performance.
So, I have a similar interest as you in the Panasonic UB9000 4K player as a possible 4K replacement for my 105. I'm considering updating my 1080p Panasonic 65" VT60 series plasma hdtv to a 2019 LG 9C series 4K OLED 65" hdtv and understand I'll need to upgrade my Bluray player to 4K also.
From what I've read, however, the UB9000 is excellent for video quality but doesn't quite equal the audio performance of either my 105 or your 95. There doesn't currently seem to be a 4K Bluray player available that both matches the video and audio quality of the 95/105 and has all their useful features. For example, both the up to 7.1 analog surround channel and balanced XLR L+R stereo outputs on the 95/105 are veryimportant to me but may not be for you. The UB9000 has both of these features/capabilities which is great but it supposedly lacks the separate and high quality audio sections and dac chips that results in superior audio performance on stereo and surround sound audio that I think are important to both of us.
I'm currently looking into the Pioneer Elite BDP-88F, the Sony current and possible upcoming high end models, and any other available brands and models I may discover,to determine whether any of these 4K players are closer matches to the 95 and 105 in audio/video quality and beneficial features. I'll post again on any hopefully successful findings.
Tim