OK, the following image is one of the worst in the entire HDTV cap. The macroblocking is terrible, but I believe it's significantly harder to see when softlight-overlaid with an accurate 35mm grain plate.
http://screenshotcomparison.com/comparison/48037
The 35mm grain plate used here was generated from real 35mm film stock. IMO, it's too coarse. I'm working on getting a finer one.