The Dell XPS 13 takes the cake.
There have been many thin and light laptops before, but you can't seriously think the Sony X505 and the Macbook Air has more similarities than the new ultrabooks and the Macbook Air.
This Dell for example has the same corner radius for the chassis, same port placement, has a battery level indicator button like Macbook Pros, same wedge angle, black edge to edge glass screen with metal surrounding rim, dropped hinge design with black plastic strip. I'm not claiming Apple has exclusive rights to these design elements, but just using all of them in a way that overall is so similar to Apple's design is shameful as a 'designer'.
Many people say Sony invented the chicklet keyboard and Apple is copying it. Well chicklet keyboards were around for in the 70s on computers and on calculators for the longest time, yet no one says anything when people suddenly use Apple's hinge design, black edge to edge glass with metal surround, buttonless glass trackpads, backlit keyboards, and round flat rubber feet.
People take these elements for granted, but before, laptop hinges were floppy things that rested on the base of the laptop making the screen relatively high and ports would be inaccesible on the back. Screens would have thick bezels and latches, trackpads would be small and high friction, keyboards wouldn't be backlit. I'm glad PC OEMs are finally making attractive designs, but writing off Apple completely and being completely blind to unoriginal designs doesn't promote competition.
Even when Apple uses the chicklet keyboard design you claim Sony invented, their laptops manage to look completely different from Sony's. If people want to play the game, then all laptops are 'rip offs' from the Powerbook 100 which first used the palmrest under the keyboard notebook design.