My first weekend with the Pixel 4 XL, I was at 12% battery left, with 6h 53m SoT. And was off the charger a day and a half, like 35 hours.
So that's definitely better battery life than my Pixel 3 XL. It's not super great battery, but not bad either.
And that's with force 90hz on always.
So my 3 XL was averaging like 5.5h to 6h SoT before low % battery saver kicked in. My 4 XL goes to like 7h SoT before battery saver kicks in. So I'm getting a solid one hour to 90 minutes better battery life on my 4 XL. I'd say the Pixel 4 XL is a 7.5h SoT type of battery life phone. Which a few years ago, that'd be amazing battery life, but today that's just good.
My first three days with the phone and I'm having no problems at all getting through a full day. So far I haven't ended a day with less than 35% battery. And I've been on it a lot. And I'm also keeping 90hz on all the time.