Villa - Welcome to the forums fellow Samsung owner!
These guys are great and very knowledgeable, so don't worry about a "Newbie" question.
Heck, I am a big time newbie myself but have gained lot's o' knowledge with theese guys.
I have an dvd player that upscales connected via HDMI to my 30 inch slimfit and it really brings out the detail in dvd's. I can't give you a specific answer to your question but I can tell you that I do notice a difference from my old dvd player and tv combo I had.
I think one of the things it depends on is the quality of the dvd transfer though. Sometimes, you just can't make something better if it starts out as garbage to begin with. So if the transfer is not good, well it's not going to be upscaled to look better in most cases.
If you wanna pop your eyes out of your head - get a new dvd player that can upscale, connect it via HDMI, and pick up a couple of Superbit dvd titles. WOW!!!!!!!! Is all I can say.
Good luck and enjoy your tv! Someone less long winded and more knowledgeable will answer your question soon I am sure.