Canon EOS-1D C vs Canon SX70

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Larger sensor
35mm vs 1/2.3 inch
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 6.94 vs 1.19 microns
Better low-light and dynamic range (all else equal)
Top deck display
Yes vs No
Check settings with a screen on top of the camera
Thinner
82 mm vs 116 mm
Thinner
Shoots 24p video
Yes vs No
Gives your movies a big-screen feel
Hot shoe
Hot shoe vs None
Off-camera flashes open new possibilities
Dual card slots
Yes vs No
Gives you more storage flexibility
Headphone jack
Yes vs No
Monitor audio recording while you shoot video
Longer exposure
30 vs 15 sec
Long exposures for night shots
Bulb shutter
Bulb vs No bulb
Hold the shutter open manually for long exposures
Faster JPEG shooting
12.0 fps vs 10.0 fps
Faster JPEG shooting (burst mode)
Faster shutter
1/8000 vs 1/2000 sec
Shoot wide open in bright light
Higher extended ISO
204800 vs 3200 ISO
Higher extended ISO can give more low-light flexibility

Tilt-swivel screen
Tilt-swivel vs none
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 Image Stabilization
Yes vs No
Reduces the effects of camera shake at slower shutter speeds
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 Bluetooth
Yes vs No
Always-on wireless connectivity
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Higher max flash sync
1/2000 vs 1/250 sec
Reduce the effect of ambient light in flash shots
Newer
5 years vs 11 years old
Newer cameras often support more advanced features
Lighter weight
608g vs 1545g
Lighter weight
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
Shoot 4K video
Both provide
Make sure you have a fast computer
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

Touchscreen
Neither provide
Interact with your camera just like your smartphone
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