The other thing to observe is that you are shooting raw. That does not do any post processing to the file at all. In particular, there is no sharpening. (The exception to this is if you're doing your post processing with Capture NX2, but clearly you're not doing that.)
Since there is no sharpening, you are viewing the effects of both a relatively old bayer sensor design with a relatively strong anti-aliasing filter - in other words, pretty much worst case.
If you want to have good sharpness without post processing, you will need to shoot JPEG - where the in-camera settings will be applied. Of course, then you lose the benefits of shooting raw.
Raw really means raw: you have to process it.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!