>> The
>> banding looks like media settings (too few samples).
>
> Doubtful... I increased the samples from 3 to 10 (it now takes ages to
> render), but the transition is still banded!

What settings do you use for media sampling (method, and possibly 
variance & confidence or aa_level && aa_threshold and/or jitter)?

adc_bailout might also be a candidate cause for the effect; try reducing 
it - with proper gamma handling, the default can be too low in dark areas.

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