The Lumix DMC-GH4 has a 4608 x 3456 still image resolution(s) which is higher than most MILC digital cameras that came out around the same time as it. Most MILC digital cameras that have been on the market for around the same time as it have a 1920 x 1080 still image resolution(s). This camera also have still image resolution(s) of 4608x3456, 3264x2448, 2336x1752, 1824x1368, 4608x3072, 3264x2176, 2336x1560, 1824x1216, 4608x2592, 3840x2160, 1920x1080, 1824x1024, 3456x3456, 2448x2448 and 1744x1744 and 1712x1712.
This camera's still image resolution (4608 x 3456) is actually the best still image resolution across all cameras of this spec and age.
The worst still image resolution amongst similar types of camera is 1920 x 1080.