Within the limits of my own practice - generally A3+ prints from not less than 10% of the image area - I can detect no discernible difference whatsoever in the images from the two cameras.
Part of that is because there is only a very small (approx. 1%) difference in limiting resolution.
My conclusion, therefore, has to be that it is not worth paying the extra £300 for the "E"-version. On the plus-side, I have never encountered any of the moiré that was predicted as a potential problem - even in highly textured subjects.
That may also have to do with the apertures used. Starting at f/5.6, the visible influence of diffraction will start to reduce potential aliasing for low contrast features, and by f/18 there is virtually no aliasing possible anymore, even for high contrast features. That is with high quality lenses, aliasing will be reduced at wider apertures for lesser lenses, because of the combined effect of diffraction and residual lens aberrations on the system MTF.