It might give you some idea, but I'm not sure it's a direct comparison. First, the source will make a difference, so watching something from the Internet won't compare directly to something off of DVD/Blu-Ray (Internet will almost always be worse).
But the TV is using different circuitry to process the image, and is probably a lot larger than your laptop screen, so things that might not be noticeable on a laptop might be easier to see on a large TV screen.
_________________________
Ken Cartwright
No single drop of rain feels it is responsible for the flood.
http://www.techflyer.net