lenses always fail on the sides and corners, not in the center, so there are far more visible problems with ff lenses on ff sensors.
people have been putting legacy ff lenses on 36mp+ sensors for over two years now, the pentax ff situation is nothing new under the sun, it's all been done before, people can see what it'll look like if they take the time to search.
24mp crop is nowhere near the resolution limit of the center area of ff lenses... cell phones for example have far higher pixel densities, behind cheap plastic lenses.
what pentax lens profiles are available in dxo, lightroom, etc., because that's what's needed for the raw files.
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