Should I, buy the X1 Carbon although his old since 2012?

First thanks for the answers.
I wonder if could help me decide my biggest consideration lately .
First I'm falling in love with a x1 carbon Thinkpad and I'm about going to buy him. But lately I feel that if I'm going to make a big mistake with that choice. Because we have all new 4th generation Haswell CPUs around.

Anyway I'm a student and I wonder if could help choosing something between performance and great keyboard.
Which ultrabook models?

Or

Should I go with x1 although his old since 2012.
I know the benefits about Haswell battery life and more.. But still....!?

Can you help me please ?

Thank you and best regards