I remember a lot of sd programing on HD channels when HD started to become popular, by now you would think you wouldn't see it anymore. But I still find some HD channels with a lot of sd programing.
I have alot of "SD" channels that look like HD channels too.It's being broadcast in 4:3,but the format button(*) on the remote control corrects that.Normally to stretch the picture makes the subjects on screen look heavier,where partial zoom at least to me looks the best.