I bought myself and my wife a couple of gs3s. We love the phones but hers always does much better on battery life than mine does. I am uploading a screenshot to let you experts check it out and hopefully give me advice.
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I am not an expert by any means, but that is a lot of activity for so small amount of on-screen time. And your kernel% seems high, but I have a Gnex, not an S3, so for an S3 that may be normal. I'm sure someone will comment shortly. Just my thoughts.
Are you syncing a lot? Gmail, FB, etc? Do you need the GPS on for a specific reason? How is your signal? 3G, 4G? Do you and your wife have the same apps installed?
Occasionally, an app will get 'stuck' and chew through battery life. Any or all of these issues (there are others as well) will definitely affect your battery stats.
What?! ...I'm msndrstood.
via Gnex