Depends. To see the 1/2 pixel diameter difference everything has to be optimum, rigid mount, high resolving power lens, under the point of diffraction limiting which starts at f/8 on a D800 and lower on a D7100. Theoretically, yes, it will be sharper but many things get in the way of that in practical field results. Again, if optimum distance needed to fill the frame on both, than the D800 will have higher resolving power.
None of this makes any difference in the overall impression of the image, both are capable of stunning as well as boring images Stan St Petersburg Russia