Especially seeing as Mountain Lion doesn't really have a concept of a universal "retina-like" resolution. Regular apps are just pixel-doubled (like iPhone apps on an iPad) and you have to write special code to use the high resolution. Think about it as addressing a special graphics card that has special drivers per application.

So, while Apple has that beautiful hardware, OSX is still not as good as Windows 7 (and 8) handling different resolutions.