Ok, well my 3g is running...

The old one is deffinately better quality!

Without doubt the old phone is more solid feeling in the hand and the screen quality is better on the old phone too. The colour/contrast is not right on the new 3g phone. I've got both running next to eachother with the exact same pictures etc and the pics look better on the old phone. I also noticed when I first turned it on that there was more pixelation on large writing etc and it doesn't look as quality when you're typing and the letters pop up.

I updated my old phone first and have most of the free apps on there and to be honest at the moment it feels like they've cheapened the 3g phone a lot. There's deffinately a more quality' feel to the older one in the hand plus the screen looks better.