Sony A7S III vs Sony RX100 IV

Here is a in-depth comparison of the Sony A7S III vs Sony RX100 IV, one being a Pro Mirrorless and the other is a Large Sensor Compact and both of them are designed by Sony. There is a sizeable difference between the sensor resolutions of the A7S III (12MP) and RX100 IV (20MP) and the A7S III (Full frame) and RX100 IV (1") boast totally different sensor measurements.

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The A7S III was announced 5 years later than the RX100 IV and that is quite a large gap as far as tech is concerned. Both cameras have different body design with the Sony A7S III being a SLR-style mirrorless camera and the Sony RX100 IV being a Large Sensor Compact camera.

Before going right into a complete comparison, here is a simple summation of how the A7S III grades vs the RX100 IV when considering portability, imaging, features and an overall rating.

Here is a sample of the gallery pictures for Sony Alpha A7S III and Sony Cyber-shot DSC-RX100 IV. The whole galleries are available at Sony A7S III Gallery and Sony RX100 IV Gallery.

In case you're aiming to carry your camera, you'll need to factor its weight and size. The Sony A7S III provides outer measurements of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") along with a weight of 699 grams (1.54 lbs) while the Sony RX100 IV has specifications of 102mm x 58mm x 41mm (4.0" x 2.3" x 1.6") along with a weight of 298 grams (0.66 lbs).

Check out the Sony A7S III vs Sony RX100 IV in the all new Camera and Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will vary depending on the lens you are employing at the time. The following is a front view proportions comparison of the A7S III vs the RX100 IV.

Taking into consideration size and weight, the portability score of the A7S III and RX100 IV is 61 and 89 respectively.

In many cases, it can be hard to visualise the difference between sensor sizing simply by checking specs. The visual below might give you a clearer sense of the sensor sizing in the A7S III and RX100 IV.

As you can plainly see, the 2 cameras provide different megapixel count and different sensor sizing. The A7S III using its larger sensor will make achieving bokeh easier and the Sony RX100 IV will resolve extra detail with its extra 8MP. Greater resolution will let you crop pics more aggressively. The newer A7S III is going to have an advantage with regard to sensor technology.