Image file size would not affect the quality of image in Lightroom as Lightroom does not keep originals.
It refers to the original location of the image and generate previews depending upon your import settings.
What happens when you double click on the image?
Does it generate preview and becomes better?
Could you please share a screenshot for further assistance?
This does not seem to be pixelated though the view is set to 1:1 above the navigator on top left.
Change it to Fit to view the complete image in loupe view.
That just looks a bit soft but not pixelated at all. What lens are you using? What shutter speed and aperture? What ISO? How are you focusing? The Nikon D810 is such incredible resolution that it will show any flaw in your lenses and any flaw in your technique in excruciating detail (sorry for the pun).
I used the 85mm, ISO 320, 2.8F and 800 shutter speed. When I export in JPEG the image is tack sharp, when I zoom in the eyes, do you know why its not tack sharp in LR.
Hint your screen capture can only be as good as the quality of your display screen.
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That lens should be very sharp in the center if focused right. Are you scaling upon export to jpeg? Any output sharpening? Be aware that almost any image is going to need some sharpening in the detail panel. Lightroom's default values there are really not very aggressive. Here is a quick tutorial video I found using a quick google search that shows how to use the detail sliders to get optimal sharpness out of your images: Lightroom Tutorial #5 - Sharpening and the Details Panel - YouTube
If you do not scale upon export to jpeg and don't output sharpen, could you post the NEF and the jpeg somewhere on a dropbox or similar for us to take a look?
Great link Jao, thanks for posting. Very informative and helpful and just a couple of minutes. George Jardine's video tutorial on this is 25 Min.
Thanks everyone for all your answers, I am going to check out the Tutorial. Im not sure if I do scale upon export, I will have to look at my settings.