You are honestly in most Cases better off just getting a dedicated MFT Lens. Especially if f-Stop and Field of View are of Concern. Native MFT Lenses also usually tend to be quite a bit smaller in Physical Size and Weight, cause they are designed for the Much smaller Sensor compared to 35mm FullFrame Lenses ( Which is not the Case for a lot of the Walimex / Rokinon / Samyang Lenses, cause those are often literally just Full-Frame or APS-C Lenses with a MFT Mount Screwed on).
If its for a Single Lens, for example a fast Wideangle Lens and maybe some other Fast Prime Lens, going with a Native MFT lens could also be Cheaper than a proper Adapter, especially if you consider buying used Lenses Maybe.
Getting a really good Adapter makes a lot more sense, if you either already own / have access to plenty EF Lenses or Plan on getting a lot of EF Lenses anyway for some Reason.
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As Far as Adapters go, the highest Quality Adapter i Personally seen for EF Lenses to MFT, that would make sense for a Chronos 2.1 or 1.4 is the Metabones 0,64x Speedbooster with the Cine-Locking Mechanism. This one of course costs Quite a bit, AND has the Electronics and all, but its the only one that will allow you to mount an EF lens with no Mechanical Play at all, cause it actually is Clamping the EF Mount, which no other of these Adapters do.
Now you still potentially have some Play at the MFT Mount itself, but thats still a lot more Solid mechanically than all the other Adapters, and about as good as it gets.
The Speedbooster also helps a lot with getting a wider Field of View and getting more Light into the Camera.
And the Electronics are useful, if you wanted to use some EF Lens with Electronic Aperture Control on there anyways eventually.