Leica V-LUX 3 vs Nikon P610

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Slower slow-motion
220 fps vs 120 fps
Supports slower slow-mo
Bigger pixels
~ 1.54 vs 1.34 microns
Better low-light and dynamic range (all else equal)
Larger lens aperture
f/2.8 vs f/3.3
Take photos in low-light or isolate your subject
RAW file ability
Yes vs No
Gives you more flexibility to develop your photos later
External Mic Jack
Jack vs No jack
Improved sound fidelity when shooting video
Hot shoe
Hot shoe vs None
Off-camera flashes open new possibilities
Longer exposure
60 vs 15 sec
Long exposures for night shots

Tilt-swivel screen
Tilt-swivel vs tilt-only
Tilt and swivel the screen for maximum shooting flexibility
Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
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
NFC
Yes vs No
Simplifies pairing your camera with supported phones
More telephoto lens reach
1,440 mm vs 600 mm
Capture objects farther away
Built-in GPS
GPS vs None
Geotag your photos
More dots on screen
922k vs 461k dots
Can mean greater resolution or a brighter screen
More pixels
16.1 vs 12.1 megapixels
Higher resolution photos
Faster shutter
1/4000 vs 1/2000 sec
Shoot wide open in bright light
Higher extended ISO
12800 vs 6400 ISO
Higher extended ISO can give more low-light flexibility

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
Internal flash
Both provide
Useful in a pinch for fill flash
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
Slow-motion videos
Both provide
Shoot slow-motion videos

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
Integrated ND filter
Neither provide
Shoot in daylight with a large aperture or slow shutter
Headphone jack
Neither provide
Monitor audio recording while you shoot video
Bulb shutter
Neither provide
Hold the shutter open manually for long exposures