On Premiere all 4k A7SIII codecs I've tested are just plain slow. In general it is somewhat choppy, but how each NLE handles each codec varies. I've tested various A7SIII 4k 10-bit footage using FCPX 10.4.10, Premiere 14.4.0 and Resolve 16.2.7 on my 10-core Vega 64 iMac Pro. Does anybody know if FCP has not released a codec to properly decode the footage yet?. I shot both 24 fps and 60 fps footage and the playback of the footage alone in FCP was very choppy and skipped some frames.
I shot some XAVC S 4K 10 bit 422 footage on the new A7S III and imported it into final cut pro.
