The OM-1 II wins 5 of 8 scored specs (stabilization, battery (cipa), weight); the GH6 wins 3 (resolution, burst, max video). The OM-1 II is $200 cheaper.
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FRONT (WIDTH × HEIGHT)TOP (WIDTH × DEPTH), LENS FACING DOWN
Outer sizes are exact, from the makers' dimensions. Shapes are drawn by us to show each body style; the dashed circle is the lens mount at its real diameter.
OM System OM-1 II134.8 × 91.6 × 72.7 mm · 599 g
Panasonic Lumix GH6138.4 × 100.3 × 99.6 mm · 823 g
BurstThe fastest frames per second the maker quotes. Top speeds often use the electronic shutter and may limit autofocus. Higher helps for sports, wildlife and kids.50 fps75 fpsBEST
StabilizationIn-body stabilisation. Each stop lets you shoot at half the shutter speed without blur, so 8 stops means very steady handheld shots.8.5 stopsBEST7.5 stops
AutofocusWhat the camera recognises and tracks automatically, and how dark it can get before focus struggles (lower EV is better in low light).People, animals, birds, vehicles, aircraft, trains · down to −8 EVPeople, animals · down to −4 EV
VIDEO
Max videoThe highest video resolution it records internally.4K5.8KBEST
Best 4K frame rateThe fastest 4K frame rate. 60p and above lets you slow footage down smoothly, and 120p gives 5× slow motion.4K 60p4K 120p
Colour depth10-bit records far more colour detail than 8-bit, so footage holds up when you grade it. Worth it if you edit video.10-bit 4:2:010-bit 4:2:2
Log profileA flat picture profile that keeps highlight and shadow detail for colour grading later.OM-Log400V-Log
Raw videoRaw keeps the most image data for editing, at much larger file sizes. Some cameras only record it to an external recorder.ProRes RAW over HDMIProRes RAW / Blackmagic RAW over HDMI
Open gateRecords the whole sensor area, so you can crop the same clip to both widescreen and vertical video.NoYes
HDMIFor an external monitor or recorder. Full-size HDMI is sturdier than micro HDMI.MicroFull-size
Cooling fanA built-in fan lets the camera record for long stretches without overheating.NoYes
BODY & HANDLING
Battery (CIPA)Shots per charge on the CIPA standard test, using the rear screen. Real-world numbers are often higher.520 shotsBEST380 shots
WeightBody with battery and card, without a lens.599 gBEST823 g
ViewfinderElectronic viewfinder resolution and magnification. More dots and a bigger magnification give a sharper, larger view.5.76M-dot, 1.65×3.68M-dot, 0.76×
Rear screenFully articulating screens flip to the front for vlogging; tilting screens are quicker for photos at waist or overhead height.Fully articulatingMulti-angle
Card slotsTwo slots let you record a backup copy at the same time, which matters for paid work like weddings.2x SD UHS-II1x CFexpress Type B + 1x SD UHS-II
