The store unit has been calibrated. Head back to the store and ask to see the settings.
I recently purchased the Samsung UN65HU8550 TV from Best Buy. It looked amazing in the store but since I have taken it home and set it up it just doesn't look that great. The store model was so vibrant and clear, the way mine is set up the picture looks dull and blurry. I have tried changing the brightness but that doesn't really seem to help with vibrancy of color. I spent a ton of money on this tv unless it improves I think I might have to return it...
Thanks for any suggestions