As evidenced in Google's moving of one letter one pixel to the right last year, branding and logos are absolutely obsessed over.
None more so than those of film studios, who need to make their idents as cinematic and rousing as possible and update them in accordance with advances in animation, all without tarnishing the 'classic' feel of their brand.
It's surprising just how many iterations of the 20th Century Fox logo there have been for instance, and how they encapsulate the aesthetic of their eras (also, they had some trouble with their 0s):
1977 (Star Wars)
1913 - present
Some other studios:
(Kubrick used an altered MGM logo for 2001: A Space Odyssey because he didn't want the lion's roar ruining the ambience)