What are the dimensions in pixels of a picture taken with iPhone 8 and X?
iPhone X / iPhone 8 Plus / iPhone 8


3088 px x 2320 px (FaceTime Camera)
4032 px x 3024 px (main cameras)


So the cameras have the same resolution on each model. The wide-angle lenses on the back are all stabilized. iPhone 8 Plus features a telephoto camera which is not stabilized. iPhone X has the same telephoto camera but also sports an optical image stabilization.

Source: Apple.com