the 116619 is 18k white gold, not platinum, and of course 18k gold is "softer" than stainless steel.
as for getting dents easily, I guess if someone is capable of paying roughly RM80k++ for a recent pre-owned piece or RM120k++ for a new piece, I don't think dents are something they have time to think about.
definitely one of the pieces I would like to have.