Chances are that Digital Foundry will produce a Fallout: New Vegas time-lapse video, and when we do you'll get some idea of how the additional visual refinements can transform the game.
The landscapes though are in a class of their own. However, even here, there are some pretty dodgy textures on the towns, cities and interiors. The ability to scale up to extreme resolutions and enjoy higher, tear-free frame-rates plus longer draw distances puts it into a class of its own.
As you might expect bearing in mind the PC roots of the engine, it's the computer version of Fallout 3 that is the most technically advanced.
