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it’s not just the sides you need to worry about, very high resolution sensors require quality optics with a high line-pair figure - hence why Canon updated a number of lenses when they released the 5DS and 5DSR and part of the reason why the latest high spec FF lenses cost so much.
I doubt whether older Pentax designs were ever envisaged to work with high MP digital sensors and 150MP would really be pushing/testing them, yes they might exhibit similar sharpness across the FOV, but I wouldn’t expect them to resolve a 150MP image meaning that your money on the sensor would be wasted
There is that - but there's no reason to expect some of them wouldn't manage - some comfortably out resolve the pixel pitch of the 645z as it is. Even the older 100mp full frame MF sensor would be a valid option as well which has lower pixel density.
The company can develop high quality optics - the K3m2 already shares the pixel pitch with the A7R4 sensor, which in turn shares the same pixel pitch as the 150mp full format one. Some of the older 67 lenses are incredibly sharp indeed and could cope with that sensor and there is nothing to stop them developing newer lenses to go with. It might help the 645z stand out against the Fuji system which as we've seen in this thread with sample images - even newer lenses can struggle.