4.4i (Have) vs. 4.8is (Want)

[JWMich]

So I have a 2006 4.4i. I've got it put together to just where I want it, and it's great. But the consensus here has always been so high on the 4.8is that I've kept my eyes open for one, and thought...maybe if the right thing comes along.

And a beautiful 2006 4.8is has just come on the market locally, with about 75,000 miles. So of course I had to go see it and take it out on the road. It's really nice, and in great condition. Want it.

But here's the thing...when I wound it out and hit it hard, I wasn't so blown away. There's a louder engine and exhaust note, but it's not screaming "damn" to me compared to my 4.4i when I give it the gas.

So maybe I expected more than I had a right to here - but what do you all say about the relative merits of the one I have vs. the 4.8is? Am I missing something here?