Early Biard mechanical TV had 50 lines, forties black and white TV 450, 60s colour 625 (the present TV standard) High definition is about 1200 lines.
They set the HD standard in tests where they just kept adding lines until yet more made no difference.
I have seen a HDTV in the shops showing a HDDVD. I love it.
The mountains in BBM will be breathtaking. The make-up and stick-on sideburns will look dreadfull.