Sony A7 vs Olympus E-M10 III

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Larger sensor
35mm vs 4/3
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 5.97 vs 3.78 microns
Better low-light and dynamic range (all else equal)
In-camera panoramas
Yes vs No
Stitches multiple shots into a panoramic photo
NFC
Yes vs No
Simplifies pairing your camera with supported phones
On-sensor phase detect
Yes vs No
Usually improves live view and video AF performance
External Mic Jack
Jack vs No jack
Improved sound fidelity when shooting video
More viewfinder magnification
0.71x vs 0.62x
Get a bigger view of the scene through the eye-level viewfinder
More pixels
24.3 vs 16.1 megapixels
Higher resolution photos
Headphone jack
Yes vs No
Monitor audio recording while you shoot video
Has anti-aliasing filter
Filter vs No Filter
Reduces unsightly moiré in photos
Higher extended ISO
51200 vs 25600 ISO
Higher extended ISO can give more low-light flexibility

Lens selection
Excellent vs Good
Better lens selection gives you more options
In-Camera Image Stabilization
Yes vs No
Reduces the effects of camera shake at slower shutter speeds
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
Fast startup
~1.00 vs 2.1 sec
Faster startup lets you catch the moment
More telephoto lens reach
84 mm vs 70 mm
Capture objects farther away with the kit lens
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Newer
7 years vs 11 years old
Newer cameras often support more advanced features
Lighter weight
503g vs 769g
Lighter weight
Less shutter lag
0.14 vs 0.23 sec
Focus and take a photo quickly (wide angle)
Lacks anti-aliasing filter
No Filter vs Filter
Enjoy sharper photos
Longer exposure
60 vs 30 sec
Long exposures for night shots
Faster JPEG shooting
8.6 fps vs 5.0 fps
Faster JPEG shooting (burst mode)
Bigger JPEG buffer
Unlimited vs 50 shots
Take more JPEG shots before waiting (burst mode)
Faster RAW shooting
8.6 fps vs 5.0 fps
Faster RAW shooting in burst mode
Slow-motion videos
Yes vs No
Shoot slow-motion videos
Faster shutter
1/16000 vs 1/8000 sec
Shoot wide open in bright light

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
Tiltable Screen
Both provide
Tilt the screen for shooting flexbility
Built-in Wi-Fi
Both provide
Share your photos wirelessly
HDMI out
Both provide
Use HDMI output to monitor or review video
Hot shoe
Both provide
Off-camera flashes open new possibilities
Bulb shutter
Both provide
Hold the shutter open manually for long exposures

Tilt-swivel screen
Neither provide
Tilt and swivel the screen for maximum shooting flexibility
Built-in Bluetooth
Neither provide
Always-on wireless connectivity
Built-in GPS
Neither provide
Geotag your photos
Top deck display
Neither provide
Check settings with a screen on top of the camera
Dual card slots
Neither provide
Gives you more storage flexibility

Buy the Sony A7

All A7 Deals

Buy the Olympus E-M10 III

All E-M10 III Deals

Incredibly small body for a fully-featured, full-frame camera; Very high resolution; Hybrid autofocus is reasonably fast and confident; Significantly better burst-shooting performance than A7R; Excellent image quality even at very high sensitivities; Faster x-sync than A7R; Accepts existing Alpha-mount and E-mount lenses, and can optionally crop to APS-C image circle.
Grass-is-greener syndrome when compared to its higher-res sibling; Moderate performance; Loud shutter (but electronic first-curtain helps); Mediocre battery life when using electronic viewfinder; Weak low-light autofocus considering its price; Limited selection of native Sony FE lenses.
Read our Sony A7 Review

Superbly-built, comfortable and compact body; Pairs beautifully with pancake kit lens; Excellent image quality; Excellent performance in most respects; Great single-shot autofocus; Really nice viewfinder and touch-screen display; Friendlier user interface courts amateurs.
Some controls are a bit small and tightly-packed; Hand grips are still a bit modestly-sized for larger lenses; Continuous and video autofocus just isn't up to snuff; New user interface can feel limiting to advanced photographers; Underwhelming battery life.
Read our Olympus E-M10 III Review