The Sensor of Nikon Coolpix A is bigger than Sony RX100 M2 Camera, The Nikon coolpix A features 16.2 MP DX-Format CMOS Sensor similar to Nikon D7000 / D5100 DSLR, the Sony RX100 M2 comes with 20.2MP 1″ inch Exmor R BSI CMOS Sensor.
Nikon Coolpix A have Fixed 28mm f/2.8 NIKKOR Prime Lens.
Sony RX100 M2 have bright Carl Zeiss Vario-Sonnar T* 10.4-37.1mm f/1.8-4.9 lens provides a 35mm-equivalent focal length range of 28-100mm.
Sony RX100 M2 have more optical zoom and better Macro mode compared to Nikon coolpix A.
Image Stabilization: Sony RX100 M2 features optical image stabilization, Nikon coolpix A have sensor shift image.
Continuous Shooting Speed: Sony RX100 M2 camera features 10fps continuous shooting speed, Nikon coolpix A limited to 4fps only.
Video: Sony RX100 M2 have better video mode compared to Nikon coolpix A.
Display: Sony RX100 have high resolution 3″ Tilting Display, Nikon coolpix A have fixed 3″ display.
Additional Features: Sony RX100 M2 also have built in WiFi and NFC for remote sharing of images. No such optional available for Nikon coolpix A.
High ISO TEST
High ISO test – Sony RX100 M2 have bit strong noise reduction filter, Nikon coolpix A High ISO images have more noise but more sharp compared to Sony RX100 M2.
Nikon Coolpix is using approx 2+ year old APS-C sensor of Nikon D7000 and D5100 DSLR, on the other hand Sony uses newly developed 1 inch BSI CMOS sensor.
Price Difference: Nikon coolpix A will cost you $340 extra
Verdict: If I need a pocket camera after my DSLR I will prefer Sony RX100 M2, I don’t see a big difference in image quality since Nikon is using a 2+ year old APS-C sensor compared to Sony newly developed 1 inch Exmor R BSI CMOS Sensor. Finally the choice is your’s, we have done enough work to find the major difference between both the camera.