Pentax K-3 vs Sony A7R IV

Cameras
Compare Cameras
Pentax K-3 vs Sony A7R IV

Leave Feedback

APS-C 366.6mm²
24.4 megapixels
ISO 100 - 51,200

Go in depth with our full Pentax K-3 Review.
How does it shoot? Pentax K-3 in the real world.
See real-world photos taken with the K-3.
Compare Pentax K-3 image quality against competitors.
What’s the bottom line? Read our Pentax K-3 conclusion.

35mm 849.7mm²
61.0 megapixels
ISO 100 - 32,000

Go in depth with our full Sony A7R IV Review.
How does it shoot? Sony A7R IV in the real world.
See real-world photos taken with the A7R IV.
Compare Sony A7R IV image quality against competitors.
What’s the bottom line? Read our Sony A7R IV conclusion.

Succeeded by the Pentax K-3 II
Compare K-3 vs K-3 II

Succeeded by the Sony A7R V

Buy From

Differences

Pentax K-3 advantages over Sony A7R IV

Lens selection
Excellent vs Good
Better lens selection gives you more options
Fast startup
~0.90 vs 1.3 sec
Faster startup lets you catch the moment
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Top deck display
Yes vs No
Check settings with a screen on top of the camera
Less shutter lag
0.14 vs 0.20 sec
Focus and take a photo quickly (wide angle)
Optional anti-aliasing filter
Optional vs None
Lets you choose sharper photos or reduced moiré

Sony A7R IV advantages over Pentax K-3

Larger sensor
35mm vs APS-C
More sensor area. Bigger is (generally) better.
Shoot 4K video
4K (UHD) vs 1080p
Make sure you have a fast computer
Touchscreen
Touch vs No touch
Interact with your camera just like your smartphone
Tiltable Screen
Tiltable vs Fixed
Tilt the screen for shooting flexbility
High resolution composite
Yes vs No
Combine multiple shots to form a super hi-res version
Built-in Wi-Fi
Wi-Fi vs None
Share your photos wirelessly
NFC
Yes vs No
Simplifies pairing your camera with supported phones
Built-in Bluetooth
Yes vs No
Always-on wireless connectivity
Higher effective ISO

Higher effective ISO

Maximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.

Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.

You can learn more at our glossary entry.

Maximum effective ISO test data courtesy of DxO Mark.
A7R IV test data on DxO Mark K-3 test data on DxO Mark

3,344 vs 1,216 iso
Take photos in low light with less noise
More dynamic range

More dynamic range

Cameras with more dynamic range allow you to take photos with dramatic differences in highlight and shadow areas while retaining detail in both.

Think of a brilliant sunset on a rocky beach: Bright sunset in the background, with dark rocks in the foreground. High dynamic range means more of the extremes will be faithfully reproduced.

Dynamic range test data courtesy of DxO Mark.
A7R IV test data on DxO Mark K-3 test data on DxO Mark

14.8 vs 13.4 evs
Retain detail in highlight and shadows
On-sensor phase detect
Yes vs No
Usually improves live view and video AF performance
Newer
5 years vs 11 years old
Newer cameras often support more advanced features
More viewfinder magnification
0.78x vs 0.63x
Get a bigger view of the scene through the eye-level viewfinder
More pixels
61.0 vs 24.4 megapixels
Higher resolution photos
Faster JPEG shooting
10.0 fps vs 7.1 fps
Faster JPEG shooting (burst mode)
Slow-motion videos
Yes vs No
Shoot slow-motion videos
Higher extended ISO
102400 vs 51200 ISO
Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

Focus peaking
Both provide
Your camera will highlight what's in focus
Eye-level viewfinder
Both provide
You'll be able to frame photos even when the sun is out
In-Camera Image Stabilization
Both provide
Reduces the effects of camera shake at slower shutter speeds
External Mic Jack
Both provide
Improved sound fidelity when shooting video
HDMI out
Both provide
Use HDMI output to monitor or review video
Hot shoe
Both provide
Off-camera flashes open new possibilities
Dual card slots
Both provide
Gives you more storage flexibility
Headphone jack
Both provide
Monitor audio recording while you shoot video
Bulb shutter
Both provide
Hold the shutter open manually for long exposures

Common Weaknesses

Tilt-swivel screen
Neither provide
Tilt and swivel the screen for maximum shooting flexibility
In-camera panoramas
Neither provide
Stitches multiple shots into a panoramic photo
Built-in GPS
Neither provide
Geotag your photos

User reviews

Amazon
Adorama
Read K-3 User Reviews

Amazon
Adorama
Read A7R IV User Reviews

Buy From

Your purchases support this site

Buy the Pentax K-3

Body Only

Body Only
Kit with 18-135mm Lens

All K-3 Deals

Your purchases support this site

Buy the Sony A7R IV

Body Only

All A7R IV Deals

Review Excerpt

Top-notch image quality; Great ergonomics in a compact body; Unique on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots; Optional Wi-Fi remote control
AE Lock button is poorly located; Below-average battery life for a DSLR; Rather dated-looking menu system; Requires a different battery grip accessory than its predecessors; Less third-party support than some rivals
Read our Pentax K-3 Review

Outstanding image quality; Excellent high ISOs; Fast AF performance with Eye-AF tracking; 10fps bursts at full-resolution; Improved ergonomics; Dual UHS-II card slots; Higher-res EVF.
Expensive; No 4Kp60; Buffer clearing could be faster; Menus are still frustrating; Touchscreen underutilized; No built-in flash.
Read our Sony A7R IV Review

The Competition

Compared to Nikon D7100

Pentax K-3

Nikon D7100

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$690
APS-C

Fast startup
Longer stills battery life

Compare Pentax K-3 vs Nikon D7100

Sony A7R IV

Nikon D7100

$3220
35mm

Focus peaking
Larger sensor

$690
APS-C

Less expensive
Lens selection

Compare Sony A7R IV vs Nikon D7100

Compared to Nikon D5300

Pentax K-3

Nikon D5300

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$549
APS-C

Tilt-swivel screen
Fast startup

Compare Pentax K-3 vs Nikon D5300

Sony A7R IV

Nikon D5300

$3220
35mm

Focus peaking
Larger sensor

$549
APS-C

Less expensive
Tilt-swivel screen

Compare Sony A7R IV vs Nikon D5300

Compared to Nikon D7200

Pentax K-3

Nikon D7200

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$1016
APS-C

Fast startup
Built-in Wi-Fi

Compare Pentax K-3 vs Nikon D7200

Sony A7R IV

Nikon D7200

$3220
35mm

Focus peaking
Larger sensor

$1016
APS-C

Less expensive
Lens selection

Compare Sony A7R IV vs Nikon D7200

Compared to Canon R5

Pentax K-3

Canon R5

$699
APS-C

Longer stills battery life
More telephoto lens reach

$3349
35mm

Larger sensor
Tilt-swivel screen

Compare Pentax K-3 vs Canon R5

Sony A7R IV

Canon R5

$3220
35mm

Less expensive
High resolution composite

$3349
35mm

Tilt-swivel screen
Bigger pixels

Compare Sony A7R IV vs Canon R5

Compared to Nikon Z7 II

Pentax K-3

Nikon Z7 II

$699
APS-C

More telephoto lens reach
Internal flash

$2330
35mm

Larger sensor
Shoot 4K video

Compare Pentax K-3 vs Nikon Z7 II

Sony A7R IV

Nikon Z7 II

$3220
35mm

High resolution composite
NFC

$2330
35mm

Less expensive
Bigger pixels

Compare Sony A7R IV vs Nikon Z7 II

Compare Other Cameras?