If you're asking how the quality compares to what you view/record with your Dish equipment I can't answer that as I don't have Dish.
The way TVE works with Channels DVR is that it uses your TV Provider account (Cable/Sat/OTT doesn't matter who) to authenticate you to the Network you want to watch/record. The content doesn't come from your Provider Dish, it comes from the network you're viewing/recording.
I think all are either 720p or 1080p and Stereo only.
You can compare yourself by going to the network 'watch now' website and logging in with your Dish credentials.
Just a couple of many examples.
Watch TCM
Watch ESPN