After cranking up that yotoob video, I must say thou my wifey's 2AZ-FE sounds exactly the same.
Coincidence? No. Sounds familiar? Well yeah!
Am I worried about it? Nope. Do I care? Not unless it's burning oil.
Bottomline: it's definitely not as quiet as many other ultra-luxury high-end cars out in the market but then again, it's quieter than my neighbour's cavalier, tempo and Ford arostar combined... *grin*
Q.