You asked
Om system om 1 mark ii vs panasonic lumix gh7?
For wildlife, I'd pick the OM System OM-1 Mark II. Its stacked sensor and very good bird detection make it a favourite with wildlife shooters, and it's a light kit to carry all day.
The Panasonic Lumix GH7 has more pixels, 25.2 against 20.4, and it's a video camera first, with internal ProRes RAW and no recording limits worth worrying about. If most of your work is film, the GH7 is the better buy.
Both use Micro Four Thirds, so the same lenses fit either body. For birds, I'd pair either one with the OM System M.Zuiko 100-400mm f/5-6.3 IS II or the OM System M.Zuiko 150-600mm f/5-6.3 IS. For birds in flight, aim for 1/2000s or faster.
Written by Claude from this site's pages.