I think ur question is technically incorrect.But, i wud give u the right info, which shud solve ur query.......SD Channels are STRETCHED to 16:9 resolution. So originally, although they are in 4:3, but they are stretched to 16:9. And if u dont like that stretching, U HAVE THE OPTION, to view it in 4:3. So on ur wide screen TV, u wud see black bars to left & right of ur screen.Next, on HDMI cable.....yes it wud obviously look better than the A/V cable. Just to give u a simple example.......if u have 2 watches - one which has the 3 hands in its dial, and the other has exact numbers in it, wudnt u obviously like the watch with exact numbers in it? Thats the difference between analog A/V cable & the Digital HDMI cable.