Sony Camera Upgrades - Color and Pixel Shift

[Romanko]

I use Sony A7R4 for scanning but I only used pixel shift once to create a 230 MP copy of a slide. I am not sure if it makes any difference.

Better color = better light and negative conversion software.

Shadow detail/noise/dynamic range = HDR (taking bracketed exposures).

I actually tried HDR with a 100-year old glass plate that had an insane dynamic range and it worked well and the process was very straightforward in Affinity Photo.

You didn't tell us what format you shoot and scan. For 35 mm color negative film I doubt that you can get noticeable improvement in image quality by increasing sensor resolution.

 

[Romanko]

So RGB scan lighting? Makes 3 separate exposures?

That would be ideal. Add infrared channel for dust removal and convert your camera to monochrome full spectrum.