Should I upgrade my PC?

Hi guys! I m thinking about upgrading my PC. But I m not sure if it will be worth it or not.

My current rig is..

Motherboard: Asus M5A78L-M LX PLUS

Processor: AMD FX(tm)-4170 Quad Core

PCU Cooler: Arctic Freezer 13

Graphics Card: GTX 680

RAM: G.Skill Value DDR3 8GB(1) and 4GB(1)

Soundcard: Xonar Essence STX

PSU: Rosewill 630-Watt Green Series 80 PLUSS

Monitor: Asus VG248QE

Windows 7 Ultimate

And I m thinking of upgrading to..

Casing: NZXT Phantom 820

Motherboard: ASUS MAXIMUS VII HERO

Processor: Intel I7 4790K

Cooler: Noctua NH-D15

Graphics Card: Asus GTX 980 Matrix

Soundcard: Xonar Essence STX(From my current rig)

RAM: Will use my current one

PSU: Corsair AX860i 860W

SSD and HDD: Will use my current one.

Windows 8.1 Pro

What do you guys think? Will you do the upgrade if you re in my position?