Canon/Nikon/Sony to L adapter - which is easiest to use?

[morganf]

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I am planning to buy a lens which is available with three different mounts: Canon R, Nikon Z, Sony E. I will also buy a mount adapter to use it on my Leica SL2-S. I am wondering which adapter would be the least problematic? Might there be any difference in usage and fit, between the three different mount adapters, or would all of them work equally well and allow autofocus and auto-exposure? Also which brand would be best (probably Novoflex, although they are pricy)? Thanks for any suggestions!

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[BernardC]

None of those mirrorless mounts can be adapted to L-Mount, because they have very similar mount-to-sensor distances. I've heard that there's a Sony-to-Nikon adapter on the market, but I'm not sure why anyone would want to use it.

The only "universal donor" electronic mount is Canon's EOS SLR mount. For mechanical lenses, almost anything will do, including Leica's own M mount.

I'm somewhat curious what this lens is. It's third-party, and unavailable in L-mount, so that leaves Tamron and Tokina among the Japanese brands, or one of the Chinese brands.