The rules done changed in F1 racing from last year to now and the most obvious difference between 2013 and 2014 is the sound of the engine in F1 racing cars. Before they used to be so screaming loud that they sounded like the manifestation of space laser warfare on the road. Now in 2014? It's like hearing weak go karts prancing around the track. It's that different.
Seriously, listen to it:
Here's a quick video on how much has changed over a year in F1 racing: