Direct may broadcast "full" HD @ 1920x1080 at a higher bitrate, but that doesn't tell the whole story. While that may look better on paper, that doesn't necessarily translate into better PQ. Many events are shot at 1440x1080 anyway so there will be times where there is no discernible difference in sharpness between the two resolutions. The human eye is also more sensitive to vertical resolution than horizontal resolution. The jump from 1280x720 to 1440x1080 is a lot more noticeable than the difference between 1440x1080 and 1920x1080. 1440x1080 has rectangular (1.33:1) pixels vs 1920x1080's square pixels.
For example take Direct's higher bitrate/horizonal resolution vs Dish's lower bitrate/horizontal resolution. Direct has 518,400 more pixels to deal with in regards to bandwidth. So of course a higher bitrate is required, but that doesn't necessarily mean that Direct is not bit starved. So while still/slow scenes may look more crisp on direct (that is, if the content was actually shot in 1920x1080,) Dish has a lower horizontal resolution to deal with and can take advantage of the fact that many adjacent pixels are redundant and so Dish can make fast moving scenes look better with a lower bitrate/horizontal resolution i.e. less macroblocking.
Long story short, having an appropriate bitrate for a given resolution is what really matters more so than 480 lines of horizontal resolution.
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