I can tell on my 65 inch. SD is still SD no matter how good it looks
This is true. When I display both the SD and HD format of an OTA channel in our home theater you can immediately tell the difference. Currently we watch most of our programming on a 32" in the living room, so it isn't as noticeable. Once we upgrade to a larger set (still trying to convince the wife ) we will probably want more channels in HD. For now paying less for H2H programming will allow us to put the savings toward a larger set.