http://www.gsmarena.com/nokia_lumia_1020_preview-review-952.php
"As far as image quality is concerned, the Nokia Lumia 1020 is really in a class of its own. None of the other high-end smartphones can come even close to the amount of resolved detail that the huge pixel-dense sensor and the 6-element ZEISS lens deliver. The dynamic range is also much higher than any other flagship can offer. At full resolution (38 MP or 34MP) the noise levels are comparable to those of the 13MP Galaxy S4, which is a pretty great achievement given how much more detail you get."
"Certainly, the only cameraphone that can come close to the Lumia 1020 output is the Nokia 808 PureView with its even larger sensor. As we already mentioned we compared those two side by side and found that Nokia has slightly altered the processing algorithms in its new cameraphone flagship.
Unlike the 808 PureView, which delivered natural colors that are as close to reality as we've seen any smartphone get, the Lumia 1020 goes for boosted saturation and warmer colors. We suspect this has a lot to do with the former head of Nokia imaging Damian Dinning leaving the company. Mr Dinning was a fan of more natural unprocessed look and most Nokia smartphones developed under his lead reflected that.
Now the Lumia 1020 takes a different path and goes for the punchier output even if that means sacrificing some detail. The saturation boost has cost the Lumia 1020 some fine detail, which is still present on the 808 PureView shots. We really hope Nokia tunes down the default saturation in the final product as those who like more vibrant colors can always boost the saturation from the camera settings."
"Just like the still images, the videos produced by the Lumia 1020 are beyond the capabilities of any other smartphone on the market. The detail levels are top notch, the colors are extremely pleasing and the dynamic range simply cannot be achieved with a smaller sensor. The 4x zoom when recording 1080p video is a more than welcome bonus, too."