4.8is vs. 4.4i

[TS_4.8is]

I've read a good amount of reviews that say the 4.8is is overkill and not worth the extra money... I'm getting one delivered very soon and was just curious what other 4.8is owners thought about the criticism of this car. What all the articles have in common is the notion that the 4.8is is not that "noticeably better" than the 4.4i. My good friend who is an automotive journalist specializing in BMW's & German car reviews says the 4.8is is significantly better in many ways, i.e. steering, brakes, susp., engine... I would love to hear from 4.8is owners who either have owned a 4.4i previously or driven one enough to form an opinion on this.

Thanks y'all.