It's definitely a much better level of detail comparing to stock cam on my S20+ Exynos. This is important for me as I'm so tired of the over-softening or "noise reduction" of Samsung stock, killing all details and skin texture.
Color/AWB and HDR are not always that great though. For example, leaving AWB on in portrait mode totally screws up the color . Or HDR can burn the photo too much under bright light. A more accurate config is still much needed.
Different sensors between the S20+ and Ultra, maybe the reason, but way back with S9 etc I never got better results with gcam, stock always looked better, and to be expected as the stock camera contains the framework and drivers for the camera, 3rd party do not so you lose quality
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Can you post comparison shots with gcam and stock?