Ah I can settle this debate. The displays that come with imacs and macbook pro's are very high quality. Even the regular macbook displays are above average. The majority of your windows laptops and sub $200 range lcd's don't have near the quality.
May I suggest you read up on
MBP "very high quality" displays.
Besides I think the author of the topic is comparing the quality on the same hardware. The only difference could be the calibration of the screen - if your colour profile is different on Windows and OS X, one of them could simply be brighter and more saturated, which would make it look better. Anyway, ICC profiles are standard, you can save your OS X colour profile in a file and apply it in Windows, which should give you identical results afterwards.
Apart from that, it's placebo. Graphics card drivers cannot make the picture look sharper and crisper, they only affect image quality in 3D applications.