It was just recently discovered that video promos shot by the Lumia 920 were not actually filmed using the mobile phone. Now, even the still pictures are being contested as fake and shot by a different camera. This is unfortunate since Nokia’s PureView technology is quite something. It’s not common for advertisements to fabricate such things but they usually include a fine print, albeit a very small one, to indicate such.
Based on actual pictures from various hands-on testing, the PureView phone really does make a difference compared to other mobile phone cameras, particularly in low light situations. It is unfortunate that Nokia had to deceive the consumers with this. Click on the source for more details regarding this mishap.
Source : http://sefsar.com