• APS-C 366.6mm2
  • 24.4 megapixels
  • ISO 100 - 51,200
  • 4/3 226.2mm2
  • 20.4 megapixels
  • ISO 200 - 25,600

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Differences

Pentax K-3 II advantages over Olympus E-M1 II

  • Less expensive
    $830 vs $1499
    Save money for lenses or accessories
  • Larger sensor
    APS-C vs 4/3
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 3.91 vs 3.36 microns
    Better low-light and dynamic range (all else equal)
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • Longer stills battery life
    More info 720 vs 440 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More pixels
    24.4 vs 20.4 megapixels
    Higher resolution photos
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Higher extended ISO
    51200 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Olympus E-M1 II advantages over Pentax K-3 II

  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Shoot 4K video
    4K (DCI) vs 1080p
    Make sure you have a fast computer
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • Fast startup
    ~0.80 vs 1.2 sec
    Faster startup lets you catch the moment
  • Built-in Wi-Fi
    Wi-Fi vs None
    Share your photos wirelessly
  • Higher effective ISO
    1,312 vs 1,106 iso
    Take photos in low light with less noise
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Newer
    3 years vs 5 years old
    Newer cameras often support more advanced features
  • Lighter weight
    574g vs 785g
    Lighter weight
  • More viewfinder magnification
    0.74x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • Longer exposure
    60 vs 30 sec
    Long exposures for night shots
  • Faster JPEG shooting
    60.6 fps vs 8.1 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    60.6 fps vs 8.2 fps
    Faster RAW shooting in burst mode
  • Bigger RAW buffer
    51 vs 22 shots
    Larger buffer for RAW shots (burst mode)
  • Faster shutter
    1/32000 vs 1/8000 sec
    Shoot wide open in bright light

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

  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

Review Excerpt

  • Top-notch image quality; Spectacular detail from Pixel Shift Resolution; Better performance than K-3; Geotag images with no accessories; Great ergonomics in a compact body; Clever on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots

  • No built-in flash strobe; No wireless flash support out of the box; AstroTracer function can be finicky; AE Lock button is poorly located; Below-average battery life for a prosumer DSLR; Requires a different battery grip accessory than its predecessors

  • Excellent image quality; Very good dynamic range & high ISO performance; Fantastic C-AF performance; Incredible burst rates, even with RAW; 4K UHD & Cinema 4K (DCI) video; Clean HDMI; Dual SD card slots.

  • 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.

The Competition

Compared to Fujifilm X-T2

Pentax K-3 II
Fujifilm X-T2
  • $830
  • APS-C
  • Lens selection
  • Less expensive
  • $799
  • APS-C
  • Shoot 4K video
  • In-camera panoramas
Olympus E-M1 II
Fujifilm X-T2
  • $1499
  • 4/3
  • Lens selection
  • Tilt-swivel screen
  • $799
  • APS-C
  • Less expensive
  • Larger sensor

Compared to Canon T6i

Pentax K-3 II
Canon T6i
  • $830
  • APS-C
  • Focus peaking
  • Larger sensor
  • $549
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Olympus E-M1 II
Canon T6i
  • $1499
  • 4/3
  • Focus peaking
  • In-Camera Image Stabilization
  • $549
  • APS-C
  • Less expensive
  • Larger sensor

Compared to Panasonic GX8

Pentax K-3 II
Panasonic GX8
  • $830
  • APS-C
  • Larger sensor
  • Less expensive
  • $1098
  • 4/3
  • Tilt-swivel screen
  • Shoot 4K video
Olympus E-M1 II
Panasonic GX8
  • $1499
  • 4/3
  • High resolution composite
  • Fast startup
  • $1098
  • 4/3
  • Less expensive
  • In-camera panoramas

Compared to Sony A68

Pentax K-3 II
Sony A68
  • $830
  • APS-C
  • Lens selection
  • High resolution composite
  • $598
  • APS-C
  • Less expensive
  • In-camera panoramas
Olympus E-M1 II
Sony A68
  • $1499
  • 4/3
  • Lens selection
  • Tilt-swivel screen
  • $598
  • APS-C
  • Less expensive
  • Larger sensor

Compared to Panasonic GH5

Pentax K-3 II
Panasonic GH5
  • $830
  • APS-C
  • Larger sensor
  • Less expensive
  • $1331
  • 4/3
  • Tilt-swivel screen
  • Shoot 4K video
Olympus E-M1 II
Panasonic GH5
  • $1499
  • 4/3
  • High resolution composite
  • Higher effective ISO
  • $1331
  • 4/3
  • Less expensive
  • Built-in Bluetooth
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