Canon EOS-1D C vs Leica V-LUX 4

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Larger sensor
35mm vs 1/2.3 inch
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 6.94 vs 1.54 microns
Better low-light and dynamic range (all else equal)
Shoot 4K video
4K (DCI) vs 1080p
Make sure you have a fast computer
Thinner
82 mm vs 110 mm
Thinner
Shoots 24p video
Yes vs No
Gives your movies a big-screen feel
More dots on screen
1040k vs 460k dots
Can mean greater resolution or a brighter screen
More pixels
18.1 vs 12.1 megapixels
Higher resolution photos
Dual card slots
Yes vs No
Gives you more storage flexibility
Bulb shutter
Bulb vs No bulb
Hold the shutter open manually for long exposures
Faster shutter
1/8000 vs 1/4000 sec
Shoot wide open in bright light
Higher extended ISO
204800 vs 6400 ISO
Higher extended ISO can give more low-light flexibility

Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
In-Camera Image Stabilization
Yes vs No
Reduces the effects of camera shake at slower shutter speeds
Tiltable Screen
Tiltable vs Fixed
Tilt the screen for shooting flexbility
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Lighter weight
590g vs 1545g
Lighter weight
Longer exposure
60 vs 30 sec
Long exposures for night shots
Slow-motion videos
Yes vs No
Shoot slow-motion videos

Rear display
Both provide
Review photos on the back of the camera
Eye-level viewfinder
Both provide
You'll be able to frame photos even when the sun is out
RAW file ability
Both provide
Gives you more flexibility to develop your photos later
Manual focus
Both provide
AF is for the weak. Real photographers focus manually.
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
Headphone jack
Both provide
Monitor audio recording while you shoot video

Touchscreen
Neither provide
Interact with your camera just like your smartphone
In-camera panoramas
Neither provide
Stitches multiple shots into a panoramic photo
Built-in Wi-Fi
Neither provide
Share your photos wirelessly
Built-in Bluetooth
Neither provide
Always-on wireless connectivity
Built-in GPS
Neither provide
Geotag your photos
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