I've been doing considerable research on this over the past week, myself. And unfortunately, I was reminded of something I learned in Physics - Optics class about a phenomenon called "Diffraction Limit" and "Airy Disks".
Generally speaking, the diffraction limit is reached when the Airy disc exceeds 2 times the pixel pitch of the sensor. But it's also variable by the wavelength of the light, so most calculations I see seems to use a 520nm green light for examples. I wonder if we use use a lens assembly with a larger aperture, if it would help with some of our image issues. On that topic, I think that the more greenish tint in the IMX582 images has more to with this diffusion-limitation exacerbated by the RGGB pattern from the Bayer filter...with twice as many green pixels in the pattern, and the diffusion limit hits first for green to red spectrum. Cool light filtering to lean more towards blue light should also help.
But please do your homework on what I'm remembering. There's some good articles available.