With 14.7 million pixels, the 27-inch iMac with Retina 5K display is the most powerful iMac ever. It features quad-core Intel® processors, the latest AMD graphics, a 2TB Fusion Drive, and great built-in apps. All in the same ultrathin design that's just 5mm at the edge.
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I decided to get one with 2TB fusion drive and I was afraid it would be slow coming from rMBP with SSD. All I have to say is the disc and everything else are really fast. I am very happy with the 27 5k 2015.