Olympus E-M1 III vs Sony A7R IV

Following is a comprehensive assessment of the Olympus E-M1 III and Sony A7R IV, both Pro Mirrorless digital cameras by companies Olympus and Sony. There exists a crucial gap between the image resolutions of the E-M1 III (20MP) and A7R IV (61MP) and the E-M1 III (Four Thirds) and A7R IV (Full frame) provide different sensor sizes.

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The E-M1 III was introduced 7 months after the A7R IV and they are of a similar generation. Both cameras have the same body design (SLR-style mirrorless).

Before delving straight to a comprehensive comparison, here is a brief synopsis of how the E-M1 III matches up vs the A7R IV with regards to portability, imaging, features and an overall score.

Here is a preview of the gallery photos for Olympus OM-D E-M1 Mark III and Sony Alpha A7R IV. The whole galleries are provided at Olympus E-M1 III Gallery and Sony A7R IV Gallery.

In case you're looking to carry around your camera, you will need to factor in its weight and measurements. The Olympus E-M1 III comes with physical measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") having a weight of 580 grams (1.28 lbs) and the Sony A7R IV has proportions of 129mm x 96mm x 78mm (5.1" x 3.8" x 3.1") and a weight of 665 grams (1.47 lbs).

Check out the Olympus E-M1 III and Sony A7R IV in the latest Camera and Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will vary dependant on the lens you use at that time. Following is a front view scale comparison of the E-M1 III vs the A7R IV.

Considering dimensions and weight, the portability grade of the E-M1 III and A7R IV is 67 and 62 respectively.

Normally, it can be difficult to imagine the difference between sensor sizes merely by checking technical specs. The image below will help give you a better sense of the sensor measurements in the E-M1 III and A7R IV.

As you can tell, both cameras provide different megapixel count and different sensor sizes. The E-M1 III having a tinier sensor is going to make getting shallow DOF more difficult and the Sony A7R IV will resolve extra detail using its extra 41MP. Higher resolution can also allow you to crop pictures more aggressively. The fresher E-M1 III provides a benefit in sensor technology.