I have had some time to evaluate the Hartblei 40/4 TS on a D800E. A few observations follow.
Fully shifted, this TS lens is a stellar performer with no visible softening or vignetting. It's outstanding "full-shift" performance should make for higher quality stitched images.
F/8 is a stellar aperture when it comes to contrast and minimal diffraction softening... nothing new there. F/11 is acceptable, but I am impressed with the degree of image degradation at f/16. Performance wide open is outstanding.
One significant difference in comparing this lens to the Nikkor 45 PCE is the camera meter goes wacky with a full shift. I realize shooting in Manual mode rectifies this entirely, but if one shoots in Aperture mode, the camera will overexpose by nearly 2 stops with the lens fully shifted. As long as I shoot in Manual mode and set the exposure with the lens in a neutral position, matrix metering works as expected.
Lastly, the mechanical quality of this lens is solid, precise, and without the need for "lock-down" knobs. My only complaint is the weight of the thing, it is 3.9 pounds HEAVY.