Here is a short test between Panasonic GH5 and Samsung NX1 in 4k, note that the focus is always set on manual, so there could be some “human mistake” on the process. This is not a scientific test, but I hope it can help you comparing both cameras.

In my opinion both cameras perform perfect, NX1 is more sharpen but GH5 have the posibilite to shoot in 4k 50p.

As an extra here you have a link to download 2 RAW images of GH5 and NX1 to play with them 🙂