Posted about this over on XDA but so far the Pixel 4 XL is nothing to write home about. My Galaxy S10+ and iPhone 11 Pro are both noticeably better, especially the latter. While in most cases the Pixel 4 XL will get me through the day, it will do so with very, very little battery left at the end of the day. I can easily see how a heavier day of usage will run out before bedtime. Not so with the other two phones. With that said, I do think that Google has some OS level optimizing to do that might improve the situation. My verdict on the battery is just "meh" so far. Not terrible, but not good either.