Olympus E-M1 II vs Sony A7S III

On this page, we will be matching up the Olympus E-M1 II vs Sony A7S III, both Pro Mirrorless cameras by brands Olympus and Sony. There exists a considerable gap among the image resolutions of the E-M1 II (20MP) and A7S III (12MP) and the E-M1 II (Four Thirds) and A7S III (Full frame) boast different sensor sizing.

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The E-M1 II was introduced 4 years before the A7S III and that is a fairly large difference as far as camera technology is concerned. The two cameras have the same body design (SLR-style mirrorless).

Before delving straight to a more detailed comparison, here is a quick view of how the E-M1 II scores against the A7S III with regard to portability, imaging, features and an overall grade.

This is a preview of the gallery photos for Olympus OM-D E-M1 Mark II & Sony Alpha A7S III. The whole galleries are provided at Olympus E-M1 II Gallery & Sony A7S III Gallery.

When you are planning to lug around your camera regularly, you'll need to consider its weight and size. The Olympus E-M1 II provides outer measurements of 134mm x 91mm x 67mm (5.3" x 3.6" x 2.6") accompanied by a weight of 574 grams (1.27 lbs) while the Sony A7S III has specifications of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") with a weight of 699 grams (1.54 lbs).

Contrast the Olympus E-M1 II vs Sony A7S III in our brand new Camera plus Lens Size Comparison Tool.

Bear in mind, the weight of an ILC will differ dependant on the lens you are using at the time. The following is a front view over all size comparison of the E-M1 II and the A7S III.

Using dimensions and weight, the portability rating of the E-M1 II and A7S III is 68 and 61 respectively.

Typically, it is tough to imagine the difference in sensor measurements just by checking out specs. The visual below will help give you a more clear sense of the sensor measurements in the E-M1 II and A7S III.

As you can plainly see, each of these cameras provide different megapixels and different sensor measurements. The E-M1 II with its smaller sensor is going to make getting shallower depth of field harder and the Olympus E-M1 II will produce more detail using its extra 8 Megapixels. Higher resolution can also let you crop photographs more aggressively. The older E-M1 II will be behind with regard to sensor technology.