I'm going to be the downer here: this car is significantly smaller than the Impala, yet National seems to call both of them full-size. I got stuck with a 2008 LS in Albany a few weeks ago as it was the only "full-size" they had left, and my head was touching the top of the interior even with the seat back all the way and significantly reclined.
While I'd probably still take an Malibu LTZ over an Impala LS, it's not an obvious choice for me.