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Recently thanks to Koral's and MrAdult's (Aswell as thanks to Vash's Dissidia Extractor) efforts porting models from Crisis Core and Dissidia became possible.
Also, I made something yesterday which might interest you guys. Seeing as Dissidia Sephiroth is more detailed than Crisis Core one, I decided to edit it to resemble classic Sephiroth look because the Dissidia one is based on Amano's artworks, not Nomura's. This render was done totally in a rush, so I haven't added alpha layer or proper lighting.
Here's how it looks without any texture edits:

If you'd be interested I could make the skin colors match on torso and head, shoulderpads and so on.