Anyways, folks from down under managed to compare the photographic capabilities of the HTC One with its ultra-pixels vs the Nokia Lumia 920 and the Nokia 808 Pureview. Here are the images:
HTC One with its ultra-pixel 4 MP camera:
Nokia Lumia 920:
Clearly, the Nokia Lumia 920 managed to outperform the HTC One, so i guess better luck next time HTC ? On the other hand, the Nokia 808 performed like an entry level DSLR with an APS-C sensor, without IS (Image Stabilizer), in case you notice the shaky bit in the picture.
For full-sized pictures go to: AndroidAustralia here.
On the other hand, mynokia blogs have done another test at the MWC2013 with the HTC One and compared it with the Nokia Lumia 920 & 720. Even though the Lumia 720 ran a BETA version of the camera software, you can visibly notice the 720 slightly outperforms the 920.