Took your invitation to look at the larger pixel peeping image and for some reason that file looks pretty sharp. The bridge is in focus and there is little evidence of blur. Check it out and see if you see the same.
If someone else confirms this it would put the culprit in the post processing department.. maybe some kind of image depth or resolution downsizing. Or maybe noise reduction is loosing the detail.
I looked at it as well, and its not up to expectations, it should be much sharper. If your images are not sharper, something might be wrong.