Whether you you're considering the standard-length 2013 BMW 7-Series or one of the long-wheelbase (iL) forms like the 750Li, what you get is a very spacious, comfortable large sedan, with a super-refined cabin that's plush, yet restrained.
Between the two, there is a difference worth parsing, though. Unlike the Mercedes-Benz S-Class, which is only offered in long-wheelbase form in the U.S., the 7-Series models add 5.5 inches in iL form, and most of that length goes straight to rear legroom. Entry to and exit from the backseat is definitely easier as well.
Front seats in the 7-Series have been redesigned for 2013 and are a thinner, more contoured design, mostly without extendable thigh bolsters this time; we haven't yet had these out on a long road trip, but the 7-Series has a reputation for offering superb, multi-adjustable seats good for keeping you ache-free for hours, over long stretches of smooth and rough roads. And for tall drivers, the 7-Series is simply one of the best picks.
Rear seats have also been redesigned for 2013; you can still choose from the standard bench or the individual bucket-type seats included with the Luxury Rear Seating Package, and their integrated massage and ventilation functions. With a four-zone climate control system, there's no reason backseat passengers won't be exceptionally comfortable.
For 2013, all 7-Series models now get an air suspension system, as well as dynamic damping, which allows the driver to fine-tune the ride (and handling responsiveness) depending on the road and the passengers. Also for 2013, new ambient lighting, more sound insulation, and other small changes to the interior make it a more comfortable, engaging place to travel.
While we've found some of the 7-Series cabin to be a bit too futuristic and techno-driven (it is, after all, a tech flagship for the lineup), spend up to some of the option packages and you get top-notch materials, including beautiful wood and leather, with fit and finish easily on par with Rolls-Royce.