Just an accidental observation. Long story short, I discovered that the Tablo app installed on my Sony XBR-900E has a sharper picture than the same program through the ROKU Ultra. I guess I’m not surprised, and will be trying to move to the built in Android TV platform. The old adage “you get what you pay for” comes to mind. Scaling processor in Sony is obviously superior; #1 reason I bought it.
Top pic: Roku, Bottom: Sony Android 8.0. Tablo set at 720 - 5 MBs
I have noticed similar differences between my Roku and Amazon Fire TV.
But now go directly to the OTA antenna, you’ll notice the biggest difference there