bro.... u r wrong.Bhai its all about bandwidth, cable never increase or decrease quality it only tells the story. Agar aisa hi hota toh HD channel ki need hi kyu hoti ?
sony bravia 32 inches hd ready tv purchased in 2009 - pq increases in hdmi cables. bandwith toh same hi h na uss channels ka but still pq increases via hdmi cable.
if ur logic seems to b true then what is the need of hd box as in hd boxes also pq increases of normal channels as compared to sd boxes.
i purchased new hd box on 25th july this year n found a significant difference.
lg 42 ya 48 inch ka tv h dusra - pq increases in that tv also via hdmi cables. yahan bhi chnanels ka bandwith toh same hi hoga.