Safari is the same code base as the Linux browser Konqueror which uses the KHTML engine. It is extremely fast. My pages look pretty much the same in all browsers so I guess it is just a matter of how you code.
http://www.konqueror.org/features/browser.php
Actually Macs these days are not that much different from Linux other then Adobe and Microsoft programs work on them and the GUI is very pretty, oh and plug and play works extremely well.