I have the Pixel. I had the S6 previously.
Battery life is very good in comparison to an 18mo old S6. I work in a signal challenged building that would kill my S6 practically by lunch, with very little usage. I would have to quick charge it a couple times a day to make it through a workday.
The Pixel makes it all day, and I have 10-15% when I call it a night. Probably only 2.5 SOT, but again, most of my battery gets burned searching for a signal each day. I expect new batteries to perform better, but this is better enough that that cannot be the only explanation. I would call it good to very good battery life.