The last time GOOGLE made a change to their logo it involved a kerning alteration of 1 pixel.
(the g and l were moved ever so slightly).
http://www.theguardian.com/technology/2014/may/27/google-pixel-perfect-logo
Now, the change is drastic, as the mega-corporation abandoned the serif fonts entirely and now has a sans-serif text.
https://www.google.com/?gws_rd=ssl
Today's google doodle shows the transformation in motion.