A lot of the issues I have been experiencing (Snapdragon 512GB) echo what everyone is saying here. I think almost all of the issues involve the main sensor (108MP):
1. 4K 60fps video with the main sensor is pure garbage, as everyone says. 4K 30fps is a little better, but the level of detail that you expect from a 4K video is simply still not there.
2. 4K 60fps video with zoom sensors (3x and 10x) are okay. Nothing to write home about but at least these sensors don't produce horrible grainy videos like the main sensor. The ultrawide sensor is similar; it still seems soft to me but not as grainy and noisy as the main sensor.
3. 8K 24fps video is decent, probably the best you can get out of the main sensor (provided you are not panning and not recording something that's moving fast). It appears to be just cropping the main sensor (108MP) to fit the 8k resolution, without pixel binning. You will notice that it has a much smaller field of view compared to other resolutions; the video almost looks zoomed in.
4. The main sensor often struggles to focus. You will notice this clearly when you take 108MP photos - a lot of them might look okay when not zoomed in, but you realize they were not in focus when you look closer (especially on a large 4K screen). Even when you take back-to-back 108MP photos, you will often notice that one is in focus while the next one isn't. I suspect this issue could be pervasive and is responsible for a lot of the issues with the main sensor.
Overall, the main sensor often misses focus even in bright daylight (108MP photos), and the quality of the video progressively gets worse as you increase the frames per second. If this is a limitation of the hardware, it isn't looking good at all. One other possibility is that there's something wrong with the pixel binning algorithm (8k 24fps video doesn't have the same issue as 4K 60fps, although it may simply be because of lower frames per second), which could be solved with a software update.
