I'm sure the Rodenstock 1120 Macro Sironar will equal the Nikon. OTOH, I don't think you will se much difference in terms of running out of coverage. The IC of the Rodenstock is only slightly larger than the Nikkor (277 v. 250 at 1:1). Thus, for macro work you might want to consider either the Rodenstock or Schneider 180 Macro. If you want the increased image clarity for 1:1 and larger reproduction ratios offered by a macro lens and also want that lens to do duty at infinity then you'll need to go to the 180.
BTW, nice images. Don't think I have seen the second one before.
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