I also watched Sins of the Father. The opening shot is likely a matte painting, because there is zero movement. The stars move, but the ships (both the D and BOP) remain dead still. It looks a little odd If I'm honest, but hey, its just the one shot. The rest of the episode looks crisp and detailed, and, well, while Sins of the Father isn't my favourate TNG episode, its a solid "average" ep in my opinion, and the HD treatment gives it a bit of extra shine to make it really engrossing.
Interesting. I guess Okuda was right after all about that being a matte painting and not a new CG model.