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I just bought a 2014 discounted 2.5/16/512 15 inch. Great machine and with a thunderbolt display it replaces my late 2009 27" iMac nicely.
 
Not massively but the improvements they made were a nice (force) touch.

The force touch trackpad is really nice and the extra SSD performance is real nice too.

If money isn't an issue get the 2015.

But if money is an issue, you won't go wrong with a 2014.
 
No.

He meant that 4K external display performance is improved, as in, you could only do 4k@30Hz before, you can now do 4K@60Hz. If you do not use an external display, that improvement is of no use.
Thanks. I'm more concerned about the screen staining issue now than anything else. Just about to pull the trigger, and then finding out about that.
 
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