D model?
i know there is an EX non-DG model, i own one. only difference is a coating on the elements. never really been left wanting by mine. fantastic fast lens.
dont think they made a "D" model? that doesnt exist in sigmas list of terminology..
like i say, ive got the non-DG and its fast, sharp etc. i dont think youll miss the DG to be honest.
The non DG model had the smaller tripod collar fitted; the one on the eBay link has the bigger TS-41 fitted which, although you can buy one after-market, points to this being a DG version. However, I've just run upstairs to look at my non-DG version and it says '120-300mmD' on it. There's your answer!
Cracking lens, BTW, as discussions lend themselves to this fact in the classified section right now...