Blackmagic Ursa Mini 4k vs Samsung Nx1

Here are two comparison videos with side-by-side evaluations on a number of areas, like low light, slow motion, audio, rolling shutter, and how they key.

Part 1:
Part 2:

My opinions:
Ursa Mini: better overall picture (flatter shooting profile, better color gamut) global shutter, better for green screening
Nx1: sharper, less noise in low light, better audio, better slow motion