First thing I did with my 12k was shoot a bunch of charts to fine tune my exposure and select my lens set in preparation for client work. I did find that the 12k was nearly maxing out my 52" wide ISO 12233 resolution chart.
Note - I don't have a lab, these test charts are only for my personal use and don't represent the sensor or optics.
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But I don't see a huge difference between shooting 12k and 8k as far as the recording source. I took 12k renders in to photoshop and downscaled them to 8k using photoshop to oversample and again, I didn't see significant difference between 12k to 8k and recording to an 8k source file.
So that tells me the built in algorithms are pretty good. I still shoot 12k files since I've been able to do some extra tricks in preprocessing.
Is a Ursa 12k oversampled 8k better than a red monstro at 8k? I'd be interested to learn that. I'd like to get them side-by-side looking at the same charts, under the same light, and using the same glass.
A side note.. I have not (yet) personally had any moire issues on shoots.