Olympus E-M1 vs Sony A7S III

Here is a in-depth comparison of the Olympus E-M1 versus Sony A7S III, both Pro Mirrorless digital cameras by competitors Olympus and Sony. There is a substantial difference between the image resolutions of the E-M1 (16MP) and A7S III (12MP) and the E-M1 (Four Thirds) and A7S III (Full frame) enjoy totally different sensor measurements.

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The E-M1 was manufactured 7 years before the A7S III and that is quite a big difference as far as tech is concerned. Both cameras come with the identical body type (SLR-style mirrorless).

Before diving in to a in-depth comparison, below is a quick introduction of how the E-M1 matches up against the A7S III in regards to portability, imaging, features and an overall rating.

This is a preview of the gallery images for Olympus OM-D E-M1 & Sony Alpha A7S III. The entire galleries are available at Olympus E-M1 Gallery & Sony A7S III Gallery.

For anyone who is planning to carry your camera regularly, you are going to need to factor in its weight and size. The Olympus E-M1 has got outside dimensions of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") with a weight of 497 grams (1.10 lbs) and the Sony A7S III has specifications of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") accompanied by a weight of 699 grams (1.54 lbs).

Compare the Olympus E-M1 versus Sony A7S III in our brand new Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will differ based on the lens you have at that time. Following is the front view dimensions comparison of the E-M1 vs the A7S III.

Using size and weight, the portability rating of the E-M1 and A7S III is 71 and 61 respectively.

Generally, it's difficult to visualise the gap between sensor sizing simply by looking at specifications. The visual here may provide you a stronger sense of the sensor sizes in the E-M1 and A7S III.

Plainly, both of the cameras have got different megapixel count and different sensor sizing. The E-M1 due to its tinier sensor will make shooting shallower DOF more difficult and the Olympus E-M1 will give extra detail due to its extra 4 Megapixels. Higher resolution can also let you crop photographs much more aggressively. The older E-M1 is going to be behind with regard to sensor tech.