If you’re looking for IQ the Olympus OM-D E-M1 Mark II get’s top marks,
“Comparing the image quality results of the Panasonic Lumix DC-GH5 with the high-end Panasonic DMC-GX8 and the Olympus OM-D E-M1 Mark II, we can see that although all three appear to share the same or a similar sensor, the Olympus may have adopted a slightly modified version, or at least tuned it to deliver slightly better results at higher ISOs. In our our Low-light ISO test, it delivered just over a half-stop advantage over the GH5 and GX8, and there’s a similar improvement (if slight in real terms) in dynamic range and color, at least at higher ISOs.”
, but if you want to shoot video the Panasonic GH5 is the way to go.
“Like its predecessor the GH4, there’s no doubt the Panasonic GH5 is oriented toward videographers, but there’s still plenty to like about the camera for stills use. In spite of the increase in pixel count to 20-MPix, noise remains at the same level as the earlier 16-Mpix GH4. Even when compared to the maker’s GX8 that uses a similar 20-MPix sensor, the GH5 has slightly improved dynamic range and color sensitivity.”
Olympus OM-D E-M1 Mark II: B&H Photo / Amazon / Adorama
Panasonic GH5: B&H Photo / Amazon / Adorama
Via DXO