I am thinking I might want to try a GH camera for working at school events to take stills and videos for the website. The GH2 sensor is too old, but a few questions -- Is the GH3 sensor newer? Is it the GX7 sensor? Does the GH3 have pdaf? I know the GH4 has 4K video, and I think I want to get there, but it's above my budget, so would the GH3 be a reasonable landing place for a year or so, taking stills of: indoor kids events, K-8 sports events, videos? I understand the GX7 jpgs are much improved. Is that also found in the GH3 or the GH4? Any thoughts on either for this use case is greatly appreciated.