After the updates
OnePlus released multiple updates after the initial review I wrote.
The battery life drastically improved. I'm now getting around 6 hours SoT, before the updates I only managed to squeeze around 5 hours out of the battery!
The phone in general, the fingerprint scanner and face unlock are still as fast as on day one.
One thing that is noticeable is the camera quality. The images are sharp but not over-sharpened, which is better than before. The colours are more natural it seems, whereas before some colours were a little dull. In some shots I noticed White Balance inconsistency when switching cameras, but in other scenarios it wasn't visible. I hope OnePlus fixes this in future updates.
Here are some sample shots after the updates:
The Ultra-Wide camera captures sharp but not over-sharpened images
The OnePlus 9 handles light and darker areas well. The clouds are captured in great detail without blowing out the shadows in other areas
Some visible White-Balance inconsistency
Do I still recommend this device?
Yes, I do! The OnePlus 9 is, in my opinion, a complete allrounder and OnePlus keeps improving the experience for the user with software updates!