Other than an extra 1GB of RAM, the Lumia 1020 is essentially identical to the Lumia 920 and 925, utilizing the same Qualcomm Snapdragon S4 MSM8960 dual-core 1.5GHz processor and Adreno 225 GPU.
Having said that, our actual experience with the 1020 was excellent. Browsing was smooth and responsive, even with multiple tabs open and other programs running in the background.
Our standard battery test for mobile phones includes the following parameters:
• Looping a 800 x 480-pixel video with screen brightness and volume at 100%
• Wi-Fi and Bluetooth connectivity turned on
• Constant data streaming through email and Twitter
Like its predecessors, the Lumia 1020 has a relatively low capacity non-removable 2000mAH battery. In our video looping test, it lasted just just under five hours, which is better than both the Lumia 925 and 920, but still slightly under average.
In day to day usage, we found battery life to be generally sufficient for an entire day, which included taking about 10-20 photos each day, with battery life falling to around 10% by midnight. We did however notice that taking pictures using custom settings on the Nokia Pro Cam app seemed to drain life much faster than when left on the default auto settings. Using the Creative Studio app also sapped battery life fairly quickly. Photographers planning to do a lot of shooting with the 1020 will definitely want to pick up the Nokia Camera Grip accessory which adds a secondary 1020mAh battery.
We measure the portability of a device by calculating its battery life to (weight x volume) ratio. The Lumia 1020 scored better than the Lumia 920 due to its lower weight and slimmer profile, however you should take this with a grain of salt, as the official volume measurements for the Lumia 1020 don't take into account its sizeable camera bump.
Nokia has done a fantastic job integrating the incredible 808 PureView imaging technology into its Lumia range and, while there are a few niggling concerns, like a lack of expandable storage and a somewhat chunky design, the Lumia 1020 is still, by far, the best Windows Phone 8 device to date. Of course, its biggest problem is just that: it's a Windows Phone device.
A great camera alone wasn't enough to make the 808 PureView successful, and even though Windows Phone 8 is light years ahead of Symbian, it's still a work in progress - for now at least, it just isn't as compelling a choice as either Android or iOS. Now imagine, for a moment, if the Lumia 1020 was running Android 4.2.2. I'm sure I wouldn't be the only one rushing out to buy one.
As it is, the decision to switch to Windows Phone 8 has never been more tempting - there are plenty of good camera phones out there, but there's nothing quite this good. Of course, if you've already made the switch to Windows Phone 8, and you have even the slightest interest in photography, upgrading to the Lumia 1020 should be right at the top of your to-do list.