It's not as clean as the main camera, and there are fine specs of luminance noise if you look up close, but these are mostly negligible.
The phone even came mostly bloat-free, with no third-party apps pre-installed.
Detail is excellently defined, both in straight lines and random textures, with very competent and natural processing - very 'photographic', and less 'smartphone' if that makes sense.
The Mi 11 Ultra takes a run at the iPhone for best smartphone video quality.
However, it is not secure.
.