Panasonic quickly addressed bugs in Firmware 2.1, but now there are other issues that photographers/videographers need to think about like video storage. To fully utilize the Panasonic GH5 you need to use V90 SD cards or a Ninja Inferno. Depending on how much you shoot a Ninja Inferno could become an absolute bargain. There are also videographers claiming that the AF issue has and has not been fixed, which is unfortunate. It’s likely that this complaint will continue to plague the GH5 until the Panasonic GH6 and beyond arrive with a phase detect system so complaints should be taken with a grain of salt.
Panasonic GH5: B&H photo / Amazon / Adorama
Atomos Ninja Inferno: B&H Photo / Adorama