Olympus E-P3 vs Sony A7R III

Lets look more closely at the Olympus E-P3 and Sony A7R III, former is a Entry-Level Mirrorless while the latter is a Pro Mirrorless by rivals Olympus and Sony. There is a substantial difference between the resolutions of the E-P3 (12MP) and A7R III (42MP) and the E-P3 (Four Thirds) and A7R III (Full frame) possess totally different sensor sizing.

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The E-P3 was revealed 7 years before the A7R III which is quite a big difference as far as tech is concerned. Each of the cameras come with different body type with the Olympus E-P3 being a Rangefinder-style mirrorless camera and the Sony A7R III being a SLR-style mirrorless camera.

Before going through a detailed comparison, below is a simple highlight of how the E-P3 scores vs the A7R III in the way of portability, imaging, features and an overall mark.

Below is a preview of the gallery photos for Olympus PEN E-P3 & Sony Alpha A7R III. The full galleries are viewable at Olympus E-P3 Gallery & Sony A7R III Gallery.

If you are intending to travel with your camera regularly, you will need to factor its weight and size. The Olympus E-P3 comes with outside measurements of 122mm x 69mm x 34mm (4.8" x 2.7" x 1.3") along with a weight of 369 grams (0.81 lbs) whilst the Sony A7R III has specifications of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") and a weight of 657 grams (1.45 lbs).

Contrast the Olympus E-P3 and Sony A7R III in our brand new Camera & Lens Size Comparison Tool.

Always remember, the weight of an ILC will change based on the lens you choose at that moment. The following is the front view dimensions comparison of the E-P3 compared to the A7R III.

Factoring in size and weight, the portability grade of the E-P3 and A7R III is 86 and 63 respectively.

Generally, it's hard to visualise the gap between sensor dimensions merely by looking at technical specs. The pic here will help offer you a clearer sense of the sensor sizing in the E-P3 and A7R III.

As you have seen, each of these cameras posses different megapixels and different sensor dimensions. The E-P3 having a tinier sensor will make achieving bokeh more challenging and the Sony A7R III will give you greater detail because of its extra 30 Megapixels. Higher resolution will make it easier to crop shots somewhat more aggressively. The more aged E-P3 is going to be disadvantaged with regard to sensor technology.