Have a look at this interesting comparison of the two cameras Sony RX10 III and Sony RX10 II.
|Features/ Models||Sony RX10 III||Sony RX10 II|
|Megapixel||20 megapixels||20 Megapixel CMOS Sensor|
|Sensor size||1″ (13.2 x 8.8 mm)||1″ (13.2 x 8.8 mm)|
|Low pass filter||No||No|
|Aperture Range||F2.8 – 4.0||Fixed aperture F2.8|
|Macro Range||3 cm||3 Cm|
|Image processor||Bionz X||BionzX|
|AF system||Contrast Detect||Contrast Detect|
|AF Points||25 AF points||25 AF points|
|ISO||Auto, 125 – 12800 (expands to 64-25600)||64-25600|
|Shutter Min/ mix||30-1/32000||30-1/32000|
|Continuous shooting speed||14 fps||14fps|
|Video||4K @ 30fps||4K @ 30fps|
|Display||3.0″ 1.228m-Dot Tilting Xtra Fine LCD||3.0″ 1228K-Dot Tilting Xtra Fine TFT LCD|
|Viewfinder||Electronic (100%)||XGA OLED Electronic Viewfinder|
|Wireless||WiFi and NFC||WiFi and NFC|
|Battery life||420 shots||400 shots|
|Dimensions||133 x 94 x 127 mm||129.0 x 88.1 x 102.2 mm|
|Weight||1051 g g||813 g|
Having same resolution, sensor sizes these two cameras of Sony will able to produce the same standard of images and when they have no low pass filter means the Sony RX10 III and Sony RX10 II should achieve rich details of the subjects.
Optical Zoom- The Sony’s RX10 III features 25x super-telephoto zoom lens with an extensive focal range of 24-600mm letting the users to capture the subjects’ actions from variety of distances on the other hand you have only 8.3x of optical zoom provided by Sony RX10 II, but you get constant F2.8 aperture throughout the zoom range.
By the way, each camera uses the same contrast based AF system and the same 25 AF points means these two can track the subjects with equal speed and precision.
Verdict- So far this comparison doesn’t show any huge difference in the specifications of these two Sony cameras other than optical zoom. So it’s not necessary for the RX10 II users to move to its successor camera. But the new buyers will get a powerful optical zoom option in RX10 III camera. The next decision is yours.