DxOMark have put the iPhone 8 and the iPhone 8 Plus through their extensive test suite, declaring that they are the best smartphone cameras they have tested to date. Strong points include exposure, contrast, color reproduction, and flash performance.
https://www.notebookcheck.net/iPhone-8-Plus-has-the-best-camera-on-any-smartphone-according-to-DxOMark.250870.0.html