<-- This

People are leaving off which lens. In my experience, for low-light:

Large sensor + kit (zoom) lens < Pixel Pro < Large sensor + f/1.4 prime

It's not apples-to-apples, since my phone has no optical zoom in the lens (although it somewhat makes up for it by having wide/normal/tele fixed lenses). But shooting with the main lens, it definitely beats a large sensor for low-light with a kit lens.

I think the key difference is intelligent multiframe denoising algorithms on the phone. It, in effect, shoots a video and combines.