What about the NHK analog HDTV in Japan? Though, I understand that it was discontinued.
"MUSE" worked reasonably well in satellite bandwidths, but the extreme subsampling required to fit it into 6 MHz for terrestrial use made the picture quality inferior. It had only one motion vector for the whole image, which helped for camera panning, but resulted in inferior rendition of individually moving objects. When the digital proposals were introduced, MUSE was effectively eliminated from the U.S. competition.