Is the Mid 2012 - 13 inch MBA still good

[Wreckus]

I was thinking about buying a new 11 inch MBA but not sure if it is worth it.

is there a big jump in performance from a mid 2012 MBA to a late 2014 MBA? or is my current MBA still good for a year or 2.

 

[Wreckus]

having more storage (up to 256 gb) would be great for movies on the road as well maybe do a bit more space for apps & games as it doesn't take long to get low on space currently. Also the newer video card would be a plus.