Call quality on the Lumia 1020 is great for a camera. Our friends sounded clear through the earpiece and via speakerphone, and they reported hearing us just fine, too. We were on AT&T's network in San Francisco.
When outdoors, especially with a lot of ambient noise, it gets a little harder to hear callers. The earpiece isn't as loud as other smartphones on the market, like the HTC One.
Battery life is also good. The 2,000 mAh unit inside seems paltry compared to the Android beasts out there, but it easily lasted us a day of regular use. If you're checking e-mail occasionally, sending and receiving text messages, browsing social networks and taking pictures, you should be fine during your work day on a full charge.