For people interested in how well this lens performs, here are a dozen or so RAW files. (Disclaimer; I am not a bird shooter so the bad Birds-in-flight photos are due to my inexperience with this subject)
The dropbox link is below the image showing the thumbnails.
https://www.dropbox.com/sh/kayj5aq12zcjkya/AAAIY0YDtpwtivm5U8EyFAkCa?dl=0
Kristerp 