On the way home after picking up the M3 from the dealer for scheduled service, on one of the OC freeways, we had a S550 in the #1 lane and 750Li on the #2 lane (both were brand new with no license plate). My wife recognized the new S-class right away. However, as both cars were driving side-by-side, the 7-series still looked a little taller and wider than the new S-Class.
The new S550 looks like a "mini-Maybach" but the 7-series still looks more larger.
I read an article from Motor Trend Feb 2006 which listed the size of the S-class vs. the competitors (Jaguar XJ8, Audi A8, and 750Li)....The S-class is the longest and slightly longer wheelbase than the 7-series, but the 7-series still has more headroom, legroom for both the front & rear and trunk room than the new S550, Jag, & Audi A8.
But that S550 does look nice.