[Twix]

Only minor changes between the years. The 2015 MY has a slight lower lip added to the front of non M-Sport models. The rear hatch has an aluminum(?) sill plate, and the interior trim piece on the passenger side has a contrasting strip at the bottom. The gauge cluster is wrapped in soft touch vinyl, and may have contrasting stitching depending on model line.

I'd also be weary about buying from a used only dealer. I'd try to stick with something from the dealer or from a private sale.

Do your homework.

There's a guide in the sticky section detailing all the changes between model years.