^^ to Ken's comments.
From my understanding, a 35mm lens on a medium format would equate to around a 24mm on your D800, so to hit it dead on, you would need the 32mm Rod. That lens is heavy and pretty delicate it seems. I have only shot it once, excellent around lens. For my work it could probably replace all my wides as a 2 part shift would come to about the same field of view a the 28mm Rod and a bit more. The 32 will easily shift to 15mm without hitting the artificial vignette that Rodenstock seems to feel has to be put inside the lens. You could probably take it to around 20mm if not for the vignette issue.
Only real issue on the 32mm is: Cost, CF, filters
Cost, it cost around 7.5 to 8K for the lens, and then you will add an add between 900 and 1200 for a cambo, Alpa or Acra mount
CF, Rodenstock makes a physical CF for the lens, takes you from 86mm to 105mm. It can probably take on slim filter in front of the CF before you start to see vignetting. Not sure how well the Lee system would work on this lens. CF cost 960.00 or so.
Most people I know who have this lens also have the CF. You would have to try it both ways and see. One aspect of the 40mm Rod, (it needs no physical Cf) which is "friggin" awesome.
Filters, you can't really stack 105mm on it, and I don't know of anyone who makes a "slim" 105mm CL-PL. or ND for that matter. Lee makes a 105 adapter that would allow you put a wide angle hood around the CF.
Flare. It seems that all the retrofocus lenses from Rodenstock are prone to flare. The 40mm can get a very mean center flare that will ruin a shot. I use a hood on mine all the time. I have been told the 32mm needs this also. The 28mm is a bit more forgiving as I rarely find
I need a hood for it unless I am shooting a very direct angle to the sun.
One other note, the Schneider 35mm would get you very close (24mm) and this is an excellent lens, but you are looking at the 280 and that is not a very good combination.
Paul Caldwell