https://www.cnet.com/news/iphone-xs-vs-iphone-x-which-phone-has-the-best-camera/

These specs were pulled from the Halide app (US$5.99) which has a technical readout section that gives a breakdown on both cameras.

I took the iPhone XS and iPhone X to the sensory overload that is Candytopia in San Francisco, then around the city, to test the cameras in the real world. When reviewing the images on the phones and on a computer, I was genuinely surprised at the overall improvement in image processing on the XS.