We have both. Q7 2nd row has more legroom than the LX, but 3rd row is defninitely only for kids, with a low roofline, and narrower width. LX/Landcruiser can fit 8 in a pinch, but the 3rd row is tight for even 3 kids. Two adults car ride in the 3rd row okay, but legroom is tight and it's more difficult for adults to get to the 3rd row. The HVAC is better for the 3rd row in the LX vs. the Q7.
Sequoia is much bigger, but not in the same class luxury-wise as the Landcruiser/LX. New Range Rover looks nice, but I'm always leery of their reliability/durability. LX/Landcruisers have been rock solid with very few issues since they came out in 2008, and the previous generation was solid too.
European vehicles seem to have more maintenance issues in my experience. Jalopnik has a contributor Doug Demuro that bought a RR from Carfax, and loves how his Extended Warranty is covering the numerous repairs he's had, and he doesn't recommend buying a Range Rover without one.
2007 Q7 4.2P
1981 5000 Turbo way back in the day...