It depends on the upscaler in the tv. With a composite cable you're dropping detail and then the upscaler will generate new detail. With RGB you're just generating new detail.
Some TV's can achieve a similar effect to 2xsai on the right
http://segaretro.org/images/5/5c/2xsai.png
Others just double the pixels and it looks like the picture on the left.
You could sit further away.
That would mean moving my sofa

I think you've hit the nail on the head there psxphill, my samsung led tv looks like the image on the left :rolleyes:
Maybe a combination of the tv being slightly big and me sitting fairly close (2m) away from it

so i see the pixels and it reminds me of a commodore 64.
How do we achieve the picture on the right which the amiga is properly capable of, does the tv have to have a built in upscaler or is that something to buy separately? I've heard about indivisions but i thought that was to modify frequency settings of tv..
In the meantime i am using 4:3 scaling on my tv and it looks like something has swiped 15% of my screen at either side and replaced with black bars
