Pointless
Definition is an old and inadequate measure. The new hotness is bit-rate. Just looking at the god-awful crap that is served up in childrens TV timeslots in particular is nauseating. Lego-vision on sudden scene changes and artifacts around borders of different coloured objects make me wonder how they ever hope to keep young viewers as they grow older when they serve them low-grade slop like that. I can well imagine that even at HD for sports there will be inadequate bit-rate employed to save a bit of bandwidth and transmitter power, too bad if the rubbish codec skimps on a bit of the scene holding vital detail to see what really happened.