Among all the changes in iPhone XS and iPhone XS Max versus the iPhone X, the camera saw the most detail work from Apple, with changes like a new sensor on the iPhone XS Max, a brand new depth control feature, and a new Smart HDR feature which is one of the biggest improvements.
Photo shootout — Comparing the iPhone XS Max versus the iPhone X
iPhone 14 Pro Max vs iPhone XS Max: Camera Shootout
iPhone XS: Why It's A Whole New Camera
Photo shootout — Comparing the iPhone XS Max versus the iPhone X
iPhone XS Max vs iPhone 8 Plus
iPhone XS Max vs. Galaxy Note 9 camera comparison - CNET
A Photography Shootout: the iPhone 11 Pro vs the Canon 5D Mark IV
iPhone XS and XS Max vs. iPhone X: Camera Shootout
iPhone XS Max vs. Galaxy Note 9 camera comparison - CNET
iPhone XS and XS Max vs. iPhone X: Camera Shootout
iPhone XS Max vs. Galaxy Note 9 camera comparison - CNET
iPhone 14 Pro Max vs Huawei Mate 50 Pro: Camera Shootout
Compare The New Features Of iPhone XS Vs iPhone XS Max Camera
iPhone XS: Why It's A Whole New Camera
One month later: iPhone XS against the iPhone X in the real world