I am trying out the Sony RX100 IV camera. The question for me is whether it is worth carrying around a small camera vs. just using the iPhone 7 for casual pictures. The camera on the iPhone 7 Plus is so good, even with the small sensor, that it may not be worth having/carrying a camera like the RX100 with you.
Here is a comparison shot with the iPhone 7 Plus and the RX100 IV. I had to crop the RX100 picture slightly to match the iPhone 7 field of view (couldn't get to exact zoom match). Both were shot raw. The iPhone was shot at 1/20s, ISO 200, f1.8 and the Sony was shot at 1/30s, ISO 1000, f2.8.
The first picture just shows the full pictures side by side. They are unprocessed raw files, with no sharpening or noise reduction. The next picture is a 1:1 zoom of the unprocessed raw files, and the last picture has 50% noise reduction, and 20% sharpening applied, along with some tone corrections.
My conclusion is that, as far as image quality goes, the Sony RX100 is definitely better. But not that much better. And given the convenience of the iPhone 7, I don't think I will be keeping the RX100.