David Cardinal, writing for DxOMark:
The Apple iPhone 8 Plus has a main camera system truly worthy of a flagship phone. Similar to the iPhone 7 Plus, it features two cameras — a wide-angle 12MP main camera, and a 12MP telephoto camera with a slower lens for zooming in on subjects and for special effects such as Portrait mode. Comparing the camera datasheets of the older iPhone 7 Plus and the new iPhone 8 Plus make the two look almost identical; however, under-the-hood upgrades have given the 8 Plus an image quality and camera performance boost in almost every one of our tested categories.
I’m still curious as to the exact physical changes in the camera system — Phil Schiller said that the sensors are now larger, but what are their sizes? While the latter certainly helps, it appears that the greatest advances in the near future will be made on the software side.