The "real" BMW windshield you refer to sounds like the "optional" comfort windshield. BMW makes multiple windshields depending upon model/model year...here's a few:

• regular
• regular w/rain sensor
• Comfort (has IR coating aka $500 sunglasses)
• Comfort w/rain sensor
• protective (aka security glass)

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)