I was asking my buddy with a Lumia 920 about his battery life, and he last charged his phone on Thursday, and still has 11% left as of this morning. He uses his phone about as much as I use my 5. Gets over 20hrs of use on a single charge.
Usage or standby? If it's the latter, there's no way. I just looked it up, and about every phone on the market has an average usage time of about 6 hours, usually floating somewhere around 4 at the low end, and 8 at the highest. If the Lumia 920 lasted that long, it'd be a small miracle, and everyone would be talking about it.
My iPhone is currently sitting at 41% battery after 2 days 19 hours on standby, and 4 and a half hours of usage with Google Now on. That looks about on spec for the iPhones, which usually get about 7 1/2 hours of heavy usage out of a charge, give or take.
Here we go! I found a chart. These are all single usage scenarios, but imagine the hit if you mix and match. Like call someone, text someone, play around on the internet for half an hour. I'd say the iPhone lasts between 6-8 hours on a charge, depending on if you're using 3G/LTE or Wifi for web browsing. If you play a lot of heavier games (anything that leverages the GPU by a moderate amount, as in not Angry Birds), expect to get half that.
edit: one thing's for sure, GN doesn't use the battery nearly as much as a GPS or constantly tracking your location on the old Google based Maps. I remember seeing it knock a percent off a minute when I did that.