I have the Sony. It’s a true 42MP no aa filter. There is a mode called pixel shift that uses the stabilization to move the sensor 1 pixel in the up, down, left, and right plane to give each pixel value full RGB data. I think Fuji did it first and a lot of people thought this is like a 42MP camera taking 168MP photo. It’s more closer to having maximum color depth and shooting at ISO 25.
Other than that I know of no software tricks going on. I do want to try this on a subject, but haven’t found something worth the hassle. And it is a picky about movement in the frame and a sturdy tripod.