One of the major problems with the SIG design has always been that the bore axis seems very high, to me. I do not see that the redesigned grip changes that.
The gun will feel different in one's hand, maybe better, to some, but that is about all. It looks like a half-hearted attempt to deal with the competition from the more modern designs with interchangeable backstraps, thereby hopefully creating a little (renewed) interest in the older design. JMHO.
I don't own either, but of all of the E/U imports name plates, only the German guns have ever felt good in the (my) hand? I've not been troubled by the Sig's high bore centerline. But perhaps I've not had enough experience with them to catch the subtle nuances? While the number of H/K products I've test driven hasn't been as numerous as the Sig's, I liked their products nearly as well as the Sig. I think some of it is like are you a "K" framer, or an "L" framer.
...but I stuck with my Beretta since I don't like the fact that the slide release on the SIG is behind the decocker, which is where the slide release is on my other autos.