For me, the question is still, "Why the GH4?" Or the GX8 for that matter. Both are somewhat better than my GH2, particularly the GH4 for its better ergonomics and viewfinder, but in terms of IQ, I don't see a great leap forward. I downloaded the RAW files noted in the earlier comparison to a D750 and, yes, the GX8 does perform better at ISO 6400, but its still pretty grainy. Lr will fix the issues in any of these cameras if you shoot RAW, but it would be nice have a higher ISO capability in any M43 camera.