Check out real-world situations relating to the Lexus IS250 2006 2006 here, particularly what our experts have to say about them. The Benz is so far ahead of the Lexus that it's not even a contest.
Yes, it's disappointing that Lexus did not opt for a larger engine when it consolidated the IS200 and IS300 into one model. And yes, if you look closely, some parts are branded Toyota (everyone knows ...