Olympus E-PM1 vs Nikon P610

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Larger sensor
4/3 vs 1/2.3 inch
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 4.29 vs 1.34 microns
Better low-light and dynamic range (all else equal)
RAW file ability
Yes vs No
Gives you more flexibility to develop your photos later
Thinner
34 mm vs 106 mm
Thinner
Hot shoe
Hot shoe vs None
Off-camera flashes open new possibilities
Longer exposure
60 vs 15 sec
Long exposures for night shots
Bulb shutter
Bulb vs No bulb
Hold the shutter open manually for long exposures

Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
Tilt-swivel screen
Tilt-swivel vs none
Tilt and swivel the screen for maximum shooting flexibility
Eye-level viewfinder
Eye-level vs Rear display only
You'll be able to frame photos even when the sun is out
In-camera panoramas
Yes vs No
Stitches multiple shots into a panoramic photo
Built-in Wi-Fi
Wi-Fi vs None
Share your photos wirelessly
Built-in GPS
GPS vs None
Geotag your photos
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
More dots on screen
922k vs 460k dots
Can mean greater resolution or a brighter screen
Shoots 1080p video
Yes vs No
You'll want this if you shoot video
More pixels
16.1 vs 12.3 megapixels
Higher resolution photos
Faster JPEG shooting
7.0 fps vs 5.3 fps
Faster JPEG shooting (burst mode)
Slow-motion videos
Yes vs No
Shoot slow-motion videos

Rear display
Both provide
Review photos on the back of the camera
In-Camera Image Stabilization
Both provide
Reduces the effects of camera shake at slower shutter speeds
Manual focus
Both provide
AF is for the weak. Real photographers focus manually.
HDMI out
Both provide
Use HDMI output to monitor or review video

Touchscreen
Neither provide
Interact with your camera just like your smartphone
Built-in Bluetooth
Neither provide
Always-on wireless connectivity
On-sensor phase detect
Neither provide
Usually improves live view and video AF performance
Top deck display
Neither provide
Check settings with a screen on top of the camera
Integrated ND filter
Neither provide
Shoot in daylight with a large aperture or slow shutter
External Mic Jack
Neither provide
Improved sound fidelity when shooting video
Dual card slots
Neither provide
Gives you more storage flexibility
Headphone jack
Neither provide
Monitor audio recording while you shoot video