Main
Model
Price
Advantages
launch
Announced
Body type
Camera subcategory
Sensor
Effective pixels
Max resolution
Sensor size
Sensor type
Processor
Image ratio w:h
Sensor photo detectors
Other resolutions
Image
ISO
Boosted ISO (minimum)
White balance presets
Custom white balance
Image stabilization
Uncompressed format
JPEG quality levels
Photography features
Minimum shutter speed
Maximum shutter speed
Maximum shutter speed (electronic)
Aperture priority
Shutter priority
Manual exposure mode
Subject / scene modes
Built-in flash
Flash range
External flash
Flash modes
Continuous drive
Self-timer
Metering modes
Exposure compensation
AE Bracketing
WB Bracketing
Screen / viewfinder
Articulated LCD
Screen size
Screen dots
Touch screen
Screen type
Live view
Viewfinder type
Videography features
File Format
Microphone
Speaker
Resolutions
Videography notes
Optics & Focus
Autofocus
Digital zoom
Manual focus
Number of focus points
Lens mount
Focal length multiplier
Physical
Weight (inc. batteries)
Dimensions
Environmentally sealed
Battery
Battery details
Battery Life (CIPA)
Storage
Storage types
Connectivity
USB
HDMI
Microphone port
Headphone port
Wireless
Wireless notes
Remote control
Other features
Orientation sensor
Timelapse recording
GPS
Samples
Videos
Summary
The Sony Alpha a5100 maximum resolution of 6000 x 4000 pixels (24 megapixels) is better in comparison with the Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9) highest resolution of 4592 x 3448 pixels (16 megapixels). The Sony Alpha a5100 is produced with bigger sensor compared to the Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9): APS-C (23.5 x 15.6 mm) versus Four Thirds (17.3 x 13 mm). This is very important difference between these cameras as large sensor lets the photographer to take photos of the more professional quality. The Sony Alpha a5100 provides more presets of white balance - 10. This specification gives the photographer more control over colour. The Sony Alpha a5100 offers more focus points in compare with the Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9): 179 vs 49. More number of focus points means more convenience when attempting to focus on subjects that are not centred.
The Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9) screen is better as it has more screen dots 1,040,000 in comparison to 921,600 dots of the Sony Alpha a5100 screen. The higher dot count screen is better for reviewing photos on your camera. The Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9) provides better lowest shutter speed - 60 seconds.
The Sony Alpha a5100 battery life is better in compare to the Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9) battery life. According to CIPA standards you will be able to produce 400 shots with the Alpha a5100 and only 210 with the Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9). The Panasonic Lumix DC-GX850 (Lumix DC-GX800 / Lumix DC-GF9) weighs 269g which is 14g less in comparison with the weight of the Alpha a5100.
Taking into account the above-mentioned differences the Alpha a5100 will be the best choice. Get the list of the best offers on Amazon.