What is the best bang for your buck video camera for retro style filming at 24 fps, 4K resolution, and no camera judder ? Below $1,250?

I use an anamorphic adapter lens for an iPhone 6s Plus(+filmic pro) and while the footage is 10 times better than basic iPhone footage, I can’t help but notice the jerkiness of edged objects at 24 frames even when I’m holding the phone as still as I can. I’ve experimented with different frames, shutter speeds, ISO,
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