Background activity... Apple is brutally tight on letting things churn away in the background. Google loosens the reigns quite a bit and lets people do what they want in the background. Though, that difference may change a little bit soon. It is no secret that Apple wants to get more Google Now-like functions rolled into iOS. The problem is that doing so will lead to an increase in background processing, which by extension, will lead to higher idle load. That's a WHOLE different topic, but it leads me into my next point...
jackdubl, looking at that battery graph, I can tell that you don't have a ton of wakelocks getting fired, at least overnight. Those are the silent killer. And since you don't have a bunch in there, Doze wouldn't save you a ton. But, like I might have mentioned, don't make the mistake of assuming everyone else has the same usage. Everyone uses their phones differently... they have different apps, use different services, different usage patterns, settings.. you name it. And when you have two people with the same phone and wildly different battery performance, unless it is obvious (one burns away on Ingress 24/7 where the other one is on Twitter the entire time), I'd chance a guess that one of them has far more background services in play.
During the day, I get a lot of Google-related wakelocks, especially on my commute. But I'm not concerned much since they are all coming as a result how I am set up. I've been using Google Now heavily since it's release and I have a lot of stuff working away in there, especially location based stuff. Which is perfectly fine with me since that's precisely what I want. Now is one of the things that put the 'smart' in my smartphone.
OK...
Back to the original topic... I think that people are going to be pleasantly surprised at the battery performance of this phone. Every component is more efficient than the previous generation Nexus 5; screen, sensors, processors, modems, operating system etc. So by default it will use less power and add in an additional 400mah, I think people are going to see a sizable bump over the old 5.