Well I also have/had Dish and now have Directv again. I spent yesterday doing comparisons between D*, E*, and OTA.
StarzHD - For those who had E* when this channel launched you know that it looked super soft and had a motion blur type issue. The issues were fixed but the channel looked soft. I compared a few movies that were playing in HD and some upconverts to see if there was a difference. The upconverts looked pretty much identical. The HD showed some difference. The image looks a lot sharper. I wouldn't say Vhs to DVD type difference, but it is noticeable on a 60". There were a lot more finer details that were visible as well. Win goes to D*
HDNet - Both are downrezzed, but the D* looks sharper once again. The sharpness make certain details stand out more. Faciel textures such as wrinkles on the oldies (dan rather) were easily visible like they were when dish didn't destroy its pristine picture on HDNet. Win goes to D* again
Science Channel HD - The same on both. Really didn't notice a difference in the little I saw there. Channels like Discover, APL, nat geo, and science all look the same on D* as they do on E*. I'm assuming the slight softness is a source issue and not a provider issue. I guess I was too harsh on E* for these. No matter I have my Scifi now so I could care less. :-D
OTA Locals - D* vs OTA
This is for the Miami locals so I don't know if there are any differences in other markets. OTA wins HANDS DOWN! These local channels are watchable but they are soft, I can easily tell I am losing a lot of detail thanks to compression. On leno last night I compared the textures of the fabrics on the suits of baldwin and leno. On D* it was just a blob on OTA I could see the details of the fabric. Same thing for letterman. The faces also seemed a tad soft, though they still maintained some sharpness. Overall OTA is still the best choice for locals. I was expecting better from D* on this since they are using Mpeg-4 now, but this pretty bad IMHO.
If you go back to a year or so ago E* had an amazing picture. I loved it, only the voom channels were downrezzed but everything else was full and HDnet, Sho, and HBO looked amazing. Now they look like crap. D* use to have a horrid picture which is why I made the jump to E* a year and a half ago and I must say I am impressed with the improvements D* has made. I hope they leave these channels alone and don't donwrezz or over-compress them because they look fine the way they are. Now all they need is to move the currently downrezzed channels to Mpeg-4 so I can enjoy my HBO and SHO with the PQ it should have.