Pentax K-3 II vs Sony A7R III

In this write-up, we will be reviewing the Pentax K-3 II versus Sony A7R III, former being a Advanced DSLR while the latter is a Pro Mirrorless by competitors Pentax and Sony. There is a noticeable difference between the sensor resolutions of the K-3 II (24MP) and A7R III (42MP) and the K-3 II (APS-C) and A7R III (Full frame) feature totally different sensor dimensions.

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The K-3 II was announced 3 years earlier than the A7R III and that is quite a sizable difference as far as tech is concerned. Both cameras offer different body type with the Pentax K-3 II being a Mid-size SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before getting straight into a comprehensive comparison, below is a brief synopsis of how the K-3 II grades against the A7R III when it comes to portability, imaging, features and an overall grade.

Below is a preview of the gallery photos for Pentax K-3 II & Sony Alpha A7R III. The whole galleries are provided at Pentax K-3 II Gallery & Sony A7R III Gallery.

For anybody who is planning to lug around your camera, you have to think about its weight and size. The Pentax K-3 II has physical measurements of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") along with a weight of 800 grams (1.76 lbs) while the Sony A7R III has specifications of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 657 grams (1.45 lbs).

Take a look at the Pentax K-3 II versus Sony A7R III in our newest Camera & Lens Size Comparison Tool.

Take into account, the weight of an ILC will change dependant on the lens you have attached at that moment. Below is the front view scale comparison of the K-3 II versus the A7R III.

Factoring in size and weight, the portability score of the K-3 II and A7R III is 59 and 63 respectively.

In many cases, its hard to visualise the gap between sensor measurements purely by reading through specs. The graphic below will help provide you a far better sense of the sensor measurements in the K-3 II and A7R III.

All in all, both the cameras offer different megapixels and different sensor measurements. The K-3 II having a tinier sensor will make shooting shallower depth of field harder and the Sony A7R III will give you more detail with its extra 18MP. Higher resolution can also help you crop pictures a little more aggressively. The older K-3 II is going to be behind with regard to sensor tech.