Nah, even with the preview pane, it's still a world away in terms of presenting a beautiful, uncluttered interface, and just overall feel (stuff like supporting gmail shortcuts, synching reliably and effortlessly with gmail, understanding gmail's notion of "archive", just the right amount of preview in messages, &c).

Apple Mail was also, in my experience, really flaky. Sparrow has been pretty darn solid since a couple of betas ago.