I think the spec on both is high but different. By that I mean (as far as I'm aware) the Lexus doesn't have lane departure and live traffic sat nav, in fact the Lexus sat nav is pretty poor really, and I find the Bluetooth iffy. Even so, I would choose the GS over a BMW any day. In May we did a European road trip of just under 2,500 miles and it was supremely comfortable and a real pleasure to drive, you won't be disappointed. And by all accounts in a GS450h you'll leave most others standing!