You can’t completely trust Youtube for video comparison. Videos on Youtube are compressed from the original. However you can trust that the actual video will be better than what you see on Youtube.
If you see small differences between different video cameras on Youtube, the differences might not be real.
You need to download the actual raw files from the camera to completely trust video comparison.
I once saw a nice comparison where five cameras were mounted on a board and they all shot the exact same walkabout video sequence. I’d like to see more of that.