I will NEVER believe again these effing "Panasonic Ambassadors" : these damn bloggers were ALL aware of that magenta macroblocking. They said not a single word about that...they just want the free stuff from Panasonic. Driftwood and the others are weirdly silent since 2.3 & 2.4 release.
I can see the magenta/ red smearing and tried about 30 LUT's to see which one minimized it and still rendered a good looking picture (in Resolve) I found the free Zucato Gratical LUTs to work really well found here http://deluts.businesscatalyst.com/deluts-free-lut.html
scroll down for the zucato ones