Just for framing context, this is a PhotoMechanic extract of the embedded JPG in the original unaltered raw file.
(edit the previous image of this bird I referred to, shot within a few minutes on the D300 + 500/4 + TC14, was posted here at reply 86. That was shot with flash though, so it is not directly comparable. Flash really brings out feather detail. This image was somewhat handicapped in that way)