Here is a pixel shift image using a Sony A7r3.
Pixel shift takes 4 images and moves the sensor 1 pixel for each image so you get 2 x green, 1 x red and 1 x blue.
It gives a bit more richness to the colour and reduces noise and increases sharpness.
http://www.pbase.com/gregbradley/image/167725656/large
Greg.