For those who haven’t seen it, Gartner released their 2013 Magic Quadrant for General-Purpose Disk Arrays.
As expected, the big 6 are in the top right quadrant. The difference this year is that the big 6 are bunched closer together, which most probably represents that the playing field is beginning to even out. EMC is still sitting on the throne, this is due to their marketing abilities and well built ecosystem. Also, new in the visionaries (bottom-right) is Nimble Storage, a private storage company gaining ground quickly.
I suggest you take this with a grain of salt; with software defined storage and host based flash caching around the corner, it will definitely change the game and in essence the landscape. What do you think? View the complete Gartner Analysis.