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The noise is because you haven't tweaked the settings enough. I'd use a hold out matte for the eyes and other problematic areas where reflections and spill foul up the key. That's standard practice.
It also looks to me like your source footage is compressed. The less the compression the better the key. You might try transcoding the footage to a 10 bit production codec before keying and applying some noise reduction. Then it's just a matter of cleaning up the key using matte tools or the settings in Keylight.
You should also consider some light wrap. I don't see any in your scenes. Light wrap will hide a multitude of problems and make the shots much more believable.
Thanks Rick for the tips. This should help quite a bit.
1 more question.. I posted here some time ago and asked if transcoding the footage to an uncompressed format would help with a color key, but the response I got was something along the lines of "you can't create more color information from no color information".
Would for sure help to transcode to something like prores or animation before attempting the key? The original files are .MTS, and exist as such in the Premiere timeline.
Thanks for your help,