Compared to Lumia 920, it is lighter and slimmer at 162 gm and 10.2 mm thickness. Difference also lies in the display which is AMOLED with similar PureMotion HD+ and supersensitive touchscreen tech. It does have Xenon Flash, which makes it superior to Lumia 920 in capturing images with Flash.
Have a look at the first official hands-on video,
Click here to go to Product page.