Sky HD as far as I can tell only really has 3 channels in HD, Sky 1 and two movie channels, BBC is also on Sky HD (but you need to pay Sky to watch it).
If Freeview got HD content (HD BBC1/2/ITV/4/E4 etc.. etc.. etc..) then Sky will have major competition, a FTA service offering more channels than Sky in HD without the need to pay £199 for a box and a tenner on top of the £15 for 1 channel (Sky 1, its extra for the movies).
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Sky HD
Sky HD as far as I can tell only really has 3 channels in HD, Sky 1 and two movie channels, BBC is also on Sky HD (but you need to pay Sky to watch it).
If Freeview got HD content (HD BBC1/2/ITV/4/E4 etc.. etc.. etc..) then Sky will have major competition, a FTA service offering more channels than Sky in HD without the need to pay £199 for a box and a tenner on top of the £15 for 1 channel (Sky 1, its extra for the movies).