Leica M9-P vs Sony A7S III

Here, we will be reviewing the Leica M9-P and Sony A7S III, both Pro Mirrorless digital cameras by manufacturers Leica and Sony. There exists a sizable gap between the image resolutions of the M9-P (18MP) and A7S III (12MP) but both cameras offer the identical sensor dimensions (Full frame).

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The M9-P was launched 10 years earlier than the A7S III and that is quite a significant difference as far as technology is concerned. Both the cameras feature different body design with the Leica M9-P being a Rangefinder-style mirrorless camera and the Sony A7S III being a SLR-style mirrorless camera.

Before diving right into a in depth comparison, here is a brief highlight of how the M9-P matches up versus the A7S III with regards to portability, imaging, features and an overall grade.

Following is a preview of the gallery images for Leica M9-P & Sony Alpha A7S III. The complete galleries are available at Leica M9-P Gallery & Sony A7S III Gallery.

For those who are going to lug around your camera frequently, you will want to think about its weight and dimensions. The Leica M9-P has physical dimensions of 139mm x 80mm x 37mm (5.5" x 3.1" x 1.5") with a weight of 600 grams (1.32 lbs) whilst the Sony A7S III has dimensions of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") along with a weight of 699 grams (1.54 lbs).

Check the Leica M9-P and Sony A7S III in our brand new Camera plus Lens Size Comparison Tool.

Remember, the weight of an ILC will vary based on the lens you are using at that time. Here is a front view size comparison of the M9-P and the A7S III.

Factoring in dimensions and weight, the portability score of the M9-P and A7S III is 78 and 61 respectively.

Normally, it's tough to picture the difference between sensor measurements just by reading through technical specs. The graphic below will provide you a more clear sense of the sensor dimensions in the M9-P and A7S III.

As you have seen, both of these cameras feature the identical sensor size albeit different resolution. You can expect the Leica M9-P to give you more detail utilizing its extra 6 Megapixels. Higher resolution can also let you crop photographs way more aggressively. The older M9-P is going to be disadvantaged in sensor tech.