https://www.cnet.com/news/huawei-p20-pro-vs-iphone-x-pixel-2-galaxy-s9-plus-camera-showdown/

I tested four of the best phone cameras you can get: Huawei P20 Pro, iPhone X, Samsung Galaxy S9 Plus and Google Pixel 2.

Now that dual rear cameras are commonplace, the idea of three seems like a natural evolution. I imagine one day there will be phones with four or five rear cameras in our pockets.