Looking at these images, Mongo must say Fons that the Nikon software seems to do what it says. Specifically, No. 2 looks noticeably more detailed than No. 1. As a consequence, it looks (and may well be) sharper.
No.3 has a reasonable amount of defining contrast and as such also looks sharp and detailed
Mongo only wishes he could get the Nik software to work on his CS5 on his Mac but no luck so far so have given up wasting time on them. Shame, because they seem to work