Mine has that function aswell. Really smart! I wasnt aware that older models didnt have soft close.
Thought it was standard across all models on the facelifts.

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3.0D Sport Auto, CARBON BLACK! Grey Leather, Smokey Grey Trim, Running boards, auto dim folding mirrors. 6 Disc CD Changer. Tinted windows. 19" style 132 Wheels. PDC.
Sports Pack. 6 Speed Steptronic. Communications Pack - SATNav MKIV, Digital Television tuner with Teletext.