Is the rear window factory-tinted on a 2011 RS liftback?

Reason I ask is that mine is distractingly blurry and I'm wondering if it's an after-market jobby. During the day it looks like there's a permanent film of water across the window, at night it's a disco with the lights of the cars behind me doubling, tripling, and the rest. Closer inspection reveals the tint is warped and distorting, particularly where the wires for the defogger join.

Can a good tinting place fix that? Should I replace the window? Any ideas? It really is driving me mental.

Given it's a second hand car I can't believe the previous owner didn't notice and/or rectify. I've had the car two weeks and I wanna take a hammer to the window.