First off, BIG congrats on what I feel is THE most awesome chrono on the market! I hope to handle one in the metal one day...
Regarding the finish, I'm a bit curious... I thought PT shines more than WG. I've compared two Cartier Love rings side-by-side, PT and WG. And the PT outshines the WG noticeably. Then again, the "finish" on both rings are not matte but polished. I assume the finish on the PT case is (mostly) matte; then the WG version should receive the same type finish. And the PT still appear "duller" or less shiny? Perhaps RM uses a different "grade" of PT and/or WG?
Cheers,
Wootichai