I find that the D2X definetly has smoother contrast areas but I do agree that out of the box, the D2H and D2Hs have better tone rendition...not that I can't achieve the same within my image processing anyway.
As I shoot RAW anyway, I don't use out of the box except for non important stuff.
This has to depend not only on the cameras, but also on the software used to process the NEF files.
Personally I find the D2X files to be almost perfect when they are run through BibblePro (4.2.6) whilst D2H images may be a bit oversaturated. Nikon Capture 4.3 shows a similar behaviour, but D2X may come out a little on the dull side and some colour saturation often has to be added.
Bjorn when I open your site there's a superb photo that appears, what camera and lens did you use, and I looked in your photos to see if i could see an example or two of pictures taken with the 85 f2.8 PC micro-nikkor, do you have any?
I certainly have an SP. And a Nikon S3 as well. Both are beatifully made and work perfectly 45 years afterwards. I prefer S3 to the SP for personal reasons some of which are described in my Nikon S3 review.
Personally I would rate an F2 Titan as the best made mechanical camera ever. But the SP and S3, together with the Nikon F, are not far behind.