Like I said, it depends on viewing distance. The displays dots become visible on a 720P/42" than on a 1080p/42" at, say 4ft. For the simple reason that the lower the resolution is on a larger monitor, the lousier the dot pitch becomes. At 6ft and above, that's the only time your statement becomes accurate. But then, at those distances, full HD loses any benefit on a 42" display.