Some more new images have been posted by the person who has revealed many images of Lumia 1520 today. New images reveal that Lumia 1520 captures 5 MP and 16 MP images together in dual-capture mode just like Lumia 1020 captures 5 MP and 34 Mp images. So, it seems the 20 MP sensor will allow a 16 MP or 18 MP maximum capture. This also may highlight the fact that oversampling is being used for image processing and loss-less zoom is certainly on-board then. As compared to 3X zoom for Lumia 1020 it may be less at 1.5X for still images.