Replying to Looking to possibly upgrade cams during the off season

Right now I have a GH3 with everything I need. You know the essentials Glidecam 2,000, Videomic with wind shield and a good wide angle lens. Been thinking about upgrading to a better camera over the summer and was interested in anyone else's take on this. I was thinking about getting the GH4 which would probably be my best choice seeing that I have 3 lens that are micro 4/3. But was wondering what others opinions are or recommendations.

Thanks boys