Pentax K-3 II vs Sony A7 III

Here is a complete assessment of the Pentax K-3 II versus Sony A7 III, one being a Advanced DSLR and the other is a Pro Mirrorless by competitors Pentax and Sony. The sensor resolution of the K-3 II (24MP) and the A7 III (24MP) is very similar but the K-3 II (APS-C) and A7 III (Full frame) come with different sensor dimensions.

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The K-3 II was launched 3 years prior to the A7 III and that is quite a significant gap as far as tech is concerned. Both the cameras come with different body type with the Pentax K-3 II being a Mid-size SLR camera and the Sony A7 III being a SLR-style mirrorless camera.

Before we go in to a thorough comparison, below is a quick view of how the K-3 II scores against the A7 III when it comes to portability, imaging, features and an overall rating.

This is a sample of the gallery pics for Pentax K-3 II and Sony Alpha A7 III. The complete galleries are viewable at Pentax K-3 II Gallery and Sony A7 III Gallery.

For anybody who is going to carry your camera often, you will want to consider its weight and volume. The Pentax K-3 II offers outside dimensions of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") with a weight of 800 grams (1.76 lbs) and the Sony A7 III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 650 grams (1.43 lbs).

Look at the Pentax K-3 II versus Sony A7 III in the all new Camera and Lens Size Comparison Tool.

Take into account, the weight of an Interchangeable Lens Camera will vary depending on the lens you select at that moment. Following is the front view overall size comparison of the K-3 II versus the A7 III.

Taking into consideration size and weight, the portability grade of the K-3 II and A7 III is 59 and 63 respectively.

Often, it is very difficult to visualize the difference between sensor sizing just by going over a spec sheet. The graphic below should offer you a stronger sense of the sensor dimensions in the K-3 II and A7 III.

As you can see, both of these cameras posses the exact same MP but different sensor sizing. The K-3 II has the tinier sensor which should make achieving shallow depth of field trickier. The older K-3 II is going to be disadvantaged when it comes to sensor innovation.