From my simple point of view, the 8K shooting on Note 20 Ultra is probably more like a commercial gimmick or something you could show off on your phone rather to have some real practical use. It might be useful if you apply a gimble (eg osmo mobile) to stabilise the footage as while shooting in 8K, the stabilisation is really very basic and limited. Also the Zooming, tracking auto-focus and some other stuff are not available in the 8K, either, make the 4K more practical to produce something useful (this is also considering that 8K video is not very widely watched for now). No mention the 24 fps Vs. 60 fps, that limit some of your post-editing space.
A quick video to show the problem and the fix to solve this. Basically the pen can pair but won't work after a short while, it is most likely the Bluetooth driver problem. After updating the Intel Wireless Bluetooth driver to the latest the problem is solved.
It might be quite annoying about reinstalling the OS when migrate to a new hard drive, say upgrade. Thankfully there is open-source free software helped us to solve this issue easily.
Simple speed test of new launching of Vodafone 5G in the Edinburgh area. The test was done at end 2019 so it might be still at the very early stage, the experience hopefully would be improved later this year. Layman review not technical in detail so have fun!