I would never encode to x265 in 8bit.
Some months back, I made a few 8bit vs. 10bit encoding comparisons - same CRF and settings.
I admit, that was still using x265 2.3 and things might have improved a bit since.
However, gradations were much, much better with 10bit encoding.
I always saw ugly banding in 8bit, even down to CRF13 and even with --tune grain.
I did only compare with the medium preset though - things might be better for 8bit with slow, slower, veryslow...
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