Pentax Q10 vs Fujifilm X20

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Thinner
33 mm vs 56 mm
Thinner
Higher max flash sync
1/2000 vs 1/1000 sec
Reduce the effect of ambient light in flash shots
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

Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
Larger sensor
2/3 inch vs 1/2.3 inch
More sensor area. Bigger is (generally) better.
Eye-level viewfinder
Eye-level vs Rear display only
You'll be able to frame photos even when the sun is out
Bigger pixels
~ 2.20 vs 1.54 microns
Better low-light and dynamic range (all else equal)
In-camera panoramas
Yes vs No
Stitches multiple shots into a panoramic photo
On-sensor phase detect
Yes vs No
Usually improves live view and video AF performance
Shoots 60p video
Yes vs No
A faster framerate can give you more editing options
Faster JPEG shooting
12.0 fps vs 5.0 fps
Faster JPEG shooting (burst mode)
Bigger JPEG buffer
11 vs 5 shots
Take more JPEG shots before waiting (burst mode)
Slow-motion videos
Yes vs No
Shoot slow-motion videos
Higher extended ISO
12800 vs 6400 ISO
Higher extended ISO can give more low-light flexibility

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
RAW file ability
Both provide
Gives you more flexibility to develop your photos later
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
Hot shoe
Both provide
Off-camera flashes open new possibilities

Tilt-swivel screen
Neither provide
Tilt and swivel the screen for maximum shooting flexibility
Touchscreen
Neither provide
Interact with your camera just like your smartphone
Tiltable Screen
Neither provide
Tilt the screen for shooting flexbility
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
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