Not really worth an upgrade. A 1080 would be a more reasonable upgrade, but your current GPU is still good. It's only 1 tier down from a 1070 on the GPU hierarchy (http://www.tomshardware.com/reviews/gpu-hierarchy,4388.html).
It's recommended to go up at least 3 tiers to see magical performance gains.
Probably not worth the price to go up.
EDIT: It will be better for sure, but if it's a question of worth your money, then probably not.