In fact, that depends on what you mean by "looks better".
Of course with the latest bootcamp drivers windows uses the native screen resolution and pictures and text look beautifuly crisp and clear.
But Windows does not support scaling by far, so this means you would need to turn magnification on to at least 150% (if not 200%). At this point there are quite a lot of programs not supporting this windows magnification properly, which leads some letters to hide or extrude to the spaces they are not supposed to be in.
Apart from that, the performance itself is lightning fast and flawless
(rMBP 2.6/16/512 w/ Windows 8 Pro)