Get a full frame sensor camera and wait for A7SIII? Or just get micro 4/3 GH5? HD

I basically discuss why sensor sizes are important and what effect they would have on a video. Please leave comments and tell me what your preferred sensor size is! Thank you! Amazon Link to NX1: http://amzn.to/2mpM2HK Amazon Link to XA10: http://amzn.to/2mpGRGO Amazon Link to 5D Mark IV http://amzn.to/2mpE948 Amazon Link to GH5 http://amzn.to/2mpIp3M Amazon Link to Sony A7SII http://amzn.to/2nq9ndk