I care only about the battery drain issue.
iOS 13.X - end of work day @ 55%–65%
iOS 14.0 - end of work day @ 20%–35%
Try downloading iOS 14.0.1 using the Finder or iTunes. That will ensure that you install the full IPSW installation file, and replace the entire iOS contents rather than just the delta files. You're more likely to encounter random glitches if you've only done OTA iOS updates for successive iterations. Considering that the OTA update for an iPhone 11 is already close to 4 GB, while the full IPSW file is 5.1 GB, you really don't have much reason not to do the full iOS installation.
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