This is a custom build from apple, not available in store.
Upgrades:
4.0 GHz Intel Core i7 (Haswell) (instead of the i5 3.5gighz)
32GB (instead of the 8gb)
3TB Fusion Drive (instead of the 1tb fusion)
AMD Radeon M295X GPU (4GB GDDR5) (instead of the 2gb)
Unit is a few months old, went to a macbook, so its just sitting around.
asking $2k, which includes shipping, US/CAN.
you can buy the unit from BH new for $3,500 + tax
Apple 27" iMac with Retina 5K Display Z0QX-MF88614 B&H