your right pic is stretched (circles aren't circles; and the floor grid is strectched too)
ok with this, but YOU CAN't have this on our xbox without BLUR(xbox resolution is different than a snes, of course) at least you can't have this if all the filters (software and hardware) are desactivated
The only way to have a stretched "correct" screen would be to use a hardware filter like "bilinear"
but Cospefogo and me (and many others for sure) we totally dislike the BLUR produced by all those filters on our standard tv
That's why if you don't want this damn blur and if you want a sharp screen, follow the cospefogo guide
p.s.: i totally understand if a lot of peoples like to play with a lot of filters, it's a different way of thinking

Obviously blur is noticeable in those shots above. But when I test it on my Xbox I really can't see a big difference between the pixel-perfect settings and bilinear filtering, Simple2x, and flicker filter at 0. Both look equally sharp to me. Maybe it's my eyes. Any chance of some comparison screens with these settings?
And of course the vertical size should be the same with either method. Since only the horizontal was stretched on the original video output.