The following two images have are screen shots from Mediaportal.

The first image is Freeview DVB-T TVNZ Sports Extra which is broadcast in standard def.

The second image is Freeview DVB-T Tv One which is broadcast in HD Ready def.

The difference in the colours and the depth/quality of the picture is quite amazing.

No need for all the marketing hype this is the real user test showing the very clear difference.

Close Up/Side by Side view of score display in standard def and high def.