Frank:
I have dabbled with several m4/3 cameras and lenses. Just sent a rented em 1.2 back. It was the best of the breed that I have used, but still has some limitations for my main use, bird photography. ISO performance is better, but still unacceptable for me at ISOs over 1600. I will say, the the uber clunky Olympus view software does a much better job with the chroma noise in the files than LR.
Video is better than my EM5, but not noticeably better than my GH4, and the video autofocus is still not capable enough to rely on for my needs.
I will be curious to try out the GH5 when it comes on line.
Cheers
Randy