Olympus E-M1 III vs Sony A99

Below is a thorough overview of the Olympus E-M1 III versus Sony A99, one being a Pro Mirrorless and the latter is a Advanced DSLR by rivals Olympus and Sony. The image resolution of the E-M1 III (20MP) and the A99 (24MP) is relatively well matched but the E-M1 III (Four Thirds) and A99 (Full frame) provide totally different sensor dimensions.

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The E-M1 III was manufactured 7 years later than the A99 and that is quite a sizable gap as far as tech is concerned. Both of the cameras have different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Sony A99 being a Mid-size SLR camera.

Before going straight to a more detailed comparison, here is a concise introduction of how the E-M1 III matches up vs the A99 in terms of portability, imaging, features and an overall grade.

The following is a preview of the gallery photos for Olympus OM-D E-M1 Mark III and Sony SLT-A99. The entire galleries are available at Olympus E-M1 III Gallery and Sony A99 Gallery.

For anyone who is intending to lug around your camera regularly, you will need to consider its weight and size. The Olympus E-M1 III enjoys external dimensions 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 A99 has specifications of 147mm x 111mm x 78mm (5.8" x 4.4" x 3.1") and a weight of 812 grams (1.79 lbs).

Take a look at the Olympus E-M1 III versus Sony A99 in the new Camera and Lens Size Comparison Tool.

Bear in mind, the weight of an Interchangeable Lens Camera will vary depending on the lens you choose at that time. Below is a front view dimensions comparison of the E-M1 III vs the A99.

Taking into consideration size and weight, the portability rating of the E-M1 III and A99 is 67 and 57 respectively.

Often, it can be difficult to envision the difference between sensor measurements purely by looking at a spec sheet. The photograph below should give you a far better sense of the sensor sizes in the E-M1 III and A99.

As you can see, both cameras provide different megapixel count and different sensor measurements. The E-M1 III because of its tinier sensor will make shooting bokeh more challenging and the Sony A99 will give you more detail due to its extra 4 Megapixels. Higher resolution will let you crop pictures more aggressively. The newer E-M1 III is going to have a benefit in sensor technology.