The machinery that Lexus use are different from mass produced Toyota cars they had their own assembly line despite sharing the same plant with Toyota (Tahara plant)....Lexus used only state of the art technologies and tools to make their car because they are chasing that perfection philosophy. They (Lexus) also has their own set of methods and technique on QC different from mass produced Toyota cars.
Also the engineers that got the chance to work for Lexus is itself a very honorable title. They are all finest hand picked engineers which are veterans technicians all of them are ranked according to skill level and their skill is evaluated from time to time and the application for job is very very limited. All the engineers that work for Lexus are called Takumi. Then is the most crazy thing.. Lexus will give test to the workers via the origami test (paper folding test) it's used to gauge a workers dexterity the catch is you can only use 1 hand to fold and in less than 90sec....
See link below...
Take the 'Takumi' challenge
Some of my relative says that I'm crazy for spending 200K for such a small car....but what they can't see is that owning a Lexus is not just about the car is also about its details and craftmanship....seriously I love my Lexus