You won't be able to detect the differences in IQ or see the artifacts, that's the whole point.
Below is a quote from their thread
According to van der Wolf, when differences show up, they will probably be in low contrast microdetails at spatial frequencies near theoretical max (Nyquist). This is because OLPF on the D800 is pushing the (unsharpened) response down near Nyquist, and the extra sharpening needed by D800 may not be able to pull these low contrast details out of the noise.
Sent from my iPad using Tapatalk HD