5 as in a Series 5 Samsung LCD tv? Because those are older than the newer XBR-7 LCD tvs from Sony. I think the Series 7 or even 8 tvs from Samsung are supposed to compete with the XBR-7, not the Series 5.
Sony has great TVs. Its just that they're usually overpriced when compared to the competition and I'm assuming since you're comparing these two because they're similar in price. So go for XBR-7 if that's the case.