... however the LX100 doesn't take 1:1 pixels and operates from 4112 to 3840 on the horizontal axis.
I think this is why you don't see any benefit from downscaling the 4K to 1080p - as the 4K mode from the LX100 is already performing some pixel squeezing.
I think its only the GH4 that is taking a pure 1:1 4k centre crop from the sensor.
The GX8 sensor has a greater crop (due to being 20MP) in 4K mode - and I think (from cameralabs review) its 4K mode is also not a pure 1:1 pixel reading
I wish they would give use the options
1. Use full width of sensor for 4k - but loose quality
2. Use 1:1 centre pixels - but lose some wide angle
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