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Main
Model
Price
Advantages
SENSOR Effective pixels: 20 megapixels
SENSOR Max resolution: 5472 x 3648
SENSOR Sensor size: 1″ (13.2 x 8.8 mm)
IMAGE White balance presets: 9
SCREEN / VIEWFINDER Screen dots: 1,228,800
OPTICS & FOCUS Digital zoom: Yes (5.8x)
PHYSICAL Weight (inc. batteries): 290 g (0.64 lb / 10.23 oz)
Main
Model
Price
Advantages
PHOTOGRAPHY FEATURES Maximum shutter speed: 1/4000 sec
PHOTOGRAPHY FEATURES External flash: Yes (via hot shoe)
PHOTOGRAPHY FEATURES Continuous drive: 12.0 fps
SCREEN / VIEWFINDER Viewfinder resolution: 2,360,000
OPTICS & FOCUS Optical zoom: 4×
OPTICS & FOCUS Number of focus points: 49
PHYSICAL Battery Life (CIPA): 470
Summary
The Sony Cyber-shot DSC-RX100 III maximum resolution of 5472 x 3648 pixels (20 megapixels) is better than the X30 highest resolution of 4000 x 3000 pixels (12 megapixels). The Sony Cyber-shot DSC-RX100 III has bigger sensor compared to the X30: 1 (13.2 x 8.8 mm) versus 2/3' (8.8 x 6.6 mm). It is the most significant difference between these models because large sensor lets you to produce photos of the better quality. The Sony Cyber-shot DSC-RX100 III provides more presets of white balance - 9. It gives you more control over colour. The Cyber-shot DSC-RX100 III offers more powerful 5.8x digital zoom. The X30 offers more powerful 4x optical zoom. The X30 provides more number of focus points than the Sony Cyber-shot DSC-RX100 III: 49 vs 25. More number of focus points means less risk of losing focus lock when following a moving subject.
The Sony Cyber-shot DSC-RX100 III screen is better as it offers more number of screen dots 1,228,800 in compare to 920,000 dots of the X30 screen. The higher dot count screen is better for reviewing photos on your camera.
The X30 supports external flash. An external flash provides amazing control over the exposure and lighting of the object in low light or in bright light situations where the camera owner needs to fill-flash. The X30 battery life is better in compare to the Sony Cyber-shot DSC-RX100 III battery life. In accordance with CIPA standards the photographer will be able to take 470 photos with the X30 and only 320 with the Cyber-shot DSC-RX100 III. The Cyber-shot DSC-RX100 III weighs 290g which is 133g lighter than the weight of the X30.
The Sony Cyber-shot DSC-RX100 III and the X30 have an equal number of advantages however as the Cyber-shot DSC-RX100 III has bigger sensor which is a very significant advantage then it will be the best buy.