The iPhone 5S features an 8 megapixel camera with 1.5µ pixels and an ƒ/2.2 aperture.
Not too different from it is the Nokia Lumia 925 with 8.7 megapixels PureVie with 1.4µ pixels and ƒ/2.0 aperture.
The Lumia 1020 comes with a massive 41 megapixel camera, the highest in a mobile phone right now.
The report includes pictures that analyze several functions of the devices’ sensors, including low light conditions, daytime, the front facing camera and the ease of use.
For the detailed comparison check out wpCentral.