Here’s Pixel 2 vs. Pixel 3 FULL camera comparison including photos, videos, portrait mode, and wide-angle comparisons.
Note 1: The Pixel 2 is using the latest Pixel 3 camera app, which you can download and install on any Pixel 2 or 2XL.
Note 2: Pixel 2 has identical camera as Pixel 2XL and also Pixel 3 has identical camera as Pixel 3XL.
You can download original photos used in video here and compare them yourself.