[Philip Lelyveld note: this long article contains many side-by-side comparisons of photos by the two cameras.]
So what have I learned in my time using the two flagship phones? The iPhone 7 Plus and Pixel have excellent cameras, and declaring a winner isn’t cut and dry. There are times the Pixel offers superior photos, but there are plenty of moments where the iPhone comes out on top. Photos from the Pixel often have bluer hues, whereas iPhone images are warmer. The latter also has more realistic photos, but that doesn’t mean the shots are better. A lot of times I prefer the more saturated images on the Pixel, especially in daylight conditions, but your personal preference may vary.
See the full story here: http://www.digitaltrends.com/photography/google-pixel-vs-iphone-7-plus-camera/