Pentax 645D vs Sony A9 II

On this page, we will be reviewing the Pentax 645D vs Sony A9 II, one being a Pro DSLR and the latter is a Pro Mirrorless by brands Pentax and Sony. There is a big difference among the sensor resolutions of the 645D (40MP) and A9 II (24MP) and the 645D (Medium format) and A9 II (Full frame) posses different sensor size.

Photography Glossary

The 645D was announced 10 years prior to the A9 II and that is a fairly big gap as far as camera tech is concerned. The two cameras have different body design with the Pentax 645D being a Large SLR camera and the Sony A9 II being a SLR-style mirrorless camera.

Before diving into a step-by-step comparison, here is a simple summation of how the 645D grades versus the A9 II in terms of portability, imaging, features and an overall rating.

This is a preview of the gallery photos for Pentax 645D and Sony Alpha A9 Mark II. The whole galleries are viewable at Pentax 645D Gallery and Sony A9 II Gallery.

For anyone who is aiming to carry your camera often, you have to factor in its weight and volume. The Pentax 645D has external measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs) and the Sony A9 II has sizing of 129mm x 96mm x 76mm (5.1" x 3.8" x 3.0") along with a weight of 678 grams (1.49 lbs).

Take a look at the Pentax 645D vs Sony A9 II in the new Camera with Lens Size Comparison Tool.

Take into consideration, the weight of an Interchangeable Lens Camera will change dependant on the lens you are utilising at that time. Here is a front view physical size comparison of the 645D vs the A9 II.

Factoring in size and weight, the portability grade of the 645D and A9 II is 50 and 62 respectively.

Generally, it's difficult to imagine the gap in sensor sizing purely by checking out specs. The graphic here will offer you a clearer sense of the sensor measurements in the 645D and A9 II.

All in all, both cameras have different megapixels and different sensor sizing. The 645D with its bigger sensor is going to make shooting bokeh easier and the Pentax 645D will provide more detail with its extra 16MP. Higher resolution can also enable you to crop pictures a bit more aggressively. The older 645D will be behind in sensor tech.