Olympus E-M5 vs Sony A7S III

Here, we will be evaluating the Olympus E-M5 and Sony A7S III, former is a Advanced Mirrorless while the latter is a Pro Mirrorless by competitors Olympus and Sony. There is a noticeable difference among the resolutions of the E-M5 (16MP) and A7S III (12MP) and the E-M5 (Four Thirds) and A7S III (Full frame) offer totally different sensor size.

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The E-M5 was introduced 9 years prior to the A7S III which is a fairly sizable difference as far as camera tech is concerned. Both of the cameras feature the same body design (SLR-style mirrorless).

Before diving straight to a comprehensive comparison, here is a concise overview of how the E-M5 scores vs the A7S III with regards to portability, imaging, features and an overall mark.

The following is a preview of the gallery photos for Olympus OM-D E-M5 & Sony Alpha A7S III. The whole galleries are available at Olympus E-M5 Gallery & Sony A7S III Gallery.

When you are going to travel with your camera, you're going to have to factor in its weight and volume. The Olympus E-M5 has outside dimensions of 122mm x 89mm x 43mm (4.8" x 3.5" x 1.7") with a weight of 425 grams (0.94 lbs) whilst the Sony A7S III has sizing of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") having a weight of 699 grams (1.54 lbs).

Compare the Olympus E-M5 and Sony A7S III in our brand new Camera & Lens Size Comparison Tool.

Do not forget, the weight of an ILC will change dependant on the lens you have chosen at that time. Following is a front view over all size comparison of the E-M5 and the A7S III.

Taking into consideration size and weight, the portability grade of the E-M5 and A7S III is 81 and 61 respectively.

Often, it is very hard to see the difference in sensor dimensions only by researching specs. The image here will help provide you a clearer sense of the sensor sizes in the E-M5 and A7S III.

As you can plainly see, both the cameras come with different megapixel count and different sensor dimensions. The E-M5 with its smaller sensor will make shooting shallower DOF more difficult and the Olympus E-M5 will result in greater detail using its extra 4MP. Higher resolution will allow you to crop shots a good deal more aggressively. The more aged E-M5 will be disadvantaged in sensor tech.