• APS-C 366.6mm2
  • 24.3 megapixels
  • ISO 100 - 819,200
  • 35mm 861.6mm2
  • 42.4 megapixels
  • ISO 100 - 32,000

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Differences

Pentax KP advantages over Sony A7R III

  • Less expensive
    $797* vs $2798
    Save money for lenses or accessories
  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Less shutter lag
    0.09 vs 0.25 sec
    Focus and take a photo quickly (wide angle)
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Faster shutter
    1/24000 vs 1/8000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    819200 vs 102400 ISO
    Higher extended ISO can give more low-light flexibility

Sony A7R III advantages over Pentax KP

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 4.51 vs 3.91 microns
    Better low-light and dynamic range (all else equal)
  • 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
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Yes vs No
    Always-on wireless connectivity
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Longer stills battery life
    More info 650 vs 390 shots
    Capture more photos
  • Newer
    15 months vs 2 years old
    Newer cameras often support more advanced features
  • HDMI out
    HDMI out vs None
    Use HDMI output to monitor or review video
  • More viewfinder magnification
    0.78x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    42.4 vs 24.3 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Faster JPEG shooting
    9.9 fps vs 7.1 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    82 vs 35 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster RAW shooting
    9.2 fps vs 7.0 fps
    Faster RAW shooting in burst mode
  • Bigger RAW buffer
    30 vs 10 shots
    Larger buffer for RAW shots (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

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
  • Tiltable Screen
    Both provide
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • 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
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera

User reviews

Buy From

Your purchases support this site

Buy the Pentax KP

Your purchases support this site

Buy the Sony A7R III

Review Excerpt

  • Fantastic image quality; Improved dynamic range over its predecessor; Very good high ISO performance; Much improved real-world AF performance; Class-leading burst rates, even with RAW; Improved 5-axis in-body image stabilization; Better 4K video quality; 1080/120fps video; Dual card slots; Significantly better battery life.

  • Expensive; Menus still confusing; UHS-II support only on one card slot; No optical low-pass filter means greater risk of moire; No built-in flash; Buffer clearing still slow despite UHS-II support.

The Competition

Compared to Sony A7R II

Pentax KP
Sony A7R II
  • $797
  • APS-C
  • Lens selection
  • Less expensive
  • $1798
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A7R III
Sony A7R II
  • $2798
  • 35mm
  • Touchscreen
  • High resolution composite
  • $1798
  • 35mm
  • Less expensive
  • In-camera panoramas

Compared to Nikon D5600

Pentax KP
Nikon D5600
  • $797
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $597
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Sony A7R III
Nikon D5600
  • $2798
  • 35mm
  • Focus peaking
  • Larger sensor
  • $597
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Canon T7i

Pentax KP
Canon T7i
  • $797
  • APS-C
  • Focus peaking
  • Larger sensor
  • $699
  • APS-C
  • Tilt-swivel screen
  • Touchscreen
Sony A7R III
Canon T7i
  • $2798
  • 35mm
  • Focus peaking
  • Larger sensor
  • $699
  • APS-C
  • Lens selection
  • Less expensive

Compared to Sony A9

Pentax KP
Sony A9
  • $797
  • APS-C
  • Lens selection
  • Less expensive
  • $3998
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A7R III
Sony A9
  • $2798
  • 35mm
  • Less expensive
  • High resolution composite
  • $3998
  • 35mm
  • Bigger pixels
  • Fast startup

Compared to Canon T7

Pentax KP
Canon T7
  • $797
  • APS-C
  • Focus peaking
  • Larger sensor
  • $549
  • APS-C
  • NFC
  • Longer stills battery life
Sony A7R III
Canon T7
  • $2798
  • 35mm
  • Focus peaking
  • Larger sensor
  • $549
  • APS-C
  • Lens selection
  • Internal flash
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