looks like the real one, i havent had the problem yet but i do use alot of cal mag in veg, personaly in my experiance the sister out yielded the c4.
i know there is 2 cuts of the chem d that were spread, one has the mosaic and the other one doesent, both are the real deal.
Joesy is right about that... Cause while my ChemD is hard to root and a cal/mag whore as previously described... she doesn't appear to have TMV. My source said that his chemD just didn't have the virus... There was lots of doubts about it being the real D b/c of a big confusion with many growers who were actually growing the sister. Another friend of mine is monocropping the sister, and as soon as I saw his sisters, I said "I definitely have the D."
HGO, I've seen a few pics of your D, and it's the real deal. It looks just like mine, except yours has TMV. Mine just shows cal/mag deficiencies when it's not fed right.