Pentax 645Z vs Sony A7R IV

Here, we are comparing the Pentax 645Z versus Sony A7R IV, one is a Pro DSLR and the other is a Pro Mirrorless by brands Pentax and Sony. The resolution of the 645Z (51MP) and the A7R IV (61MP) is fairly close but the 645Z (Medium format) and A7R IV (Full frame) posses different sensor size.

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The 645Z was introduced 6 years before the A7R IV which is a fairly large gap as far as camera tech is concerned. Both the cameras feature different body design with the Pentax 645Z being a Large SLR camera and the Sony A7R IV being a SLR-style mirrorless camera.

Before diving into a complete comparison, here is a quick summary of how the 645Z grades vs the A7R IV for portability, imaging, features and an overall mark.

This is a sample of the gallery pictures for Pentax 645Z and Sony Alpha A7R IV. The whole galleries are provided at Pentax 645Z Gallery and Sony A7R IV Gallery.

If you're aiming to travel with your camera frequently, you will need to consider its weight and volume. The Pentax 645Z provides physical measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") having a weight of 1550 grams (3.42 lbs) whilst the Sony A7R IV has sizing of 129mm x 96mm x 78mm (5.1" x 3.8" x 3.1") along with a weight of 665 grams (1.47 lbs).

Take a look at the Pentax 645Z versus Sony A7R IV in the all new Camera and Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will change based on the lens you have attached at the time. The following is a front view physical size comparison of the 645Z and the A7R IV.

Taking into consideration size and weight, the portability score of the 645Z and A7R IV is 49 and 62 respectively.

Usually, it can be tough to imagine the contrast in sensor dimensions just by looking through technical specs. The pic underneath will give you a better sense of the sensor sizing in the 645Z and A7R IV.

As you can tell, both of these cameras feature different megapixel count and different sensor dimensions. The 645Z with its larger sensor is going to make getting shallower DOF simpler and the Sony A7R IV will provide you with more detail using its extra 10MP. Greater resolution will let you crop photos way more aggressively. The more aged 645Z will be behind in sensor innovation.