What's the difference between the 4k60 framework of gh5 and the 4K60 framework?

Only the recording speed is twice as fast and the playback speed is twice as slow.

Simply put, the iPhone8 can shoot twice as much in slow motion.

IPhone7 doesn't work

But even if you don't need the function of slow-motion video, you can usually shoot 30 frames of video, and the quality of high-speed sensors that can support 60 frames will be better.