The RM UP-01 is thinner. "This new ultra-thin timepiece is a mere 1.75mm in thickness beating out Bulgari by a walloping 0.05mm." Source: https://www.hodinkee.

The RM UP-01 is thinner. "This new ultra-thin timepiece is a mere 1.75mm in thickness beating out Bulgari by a walloping 0.05mm." Source: https://www.hodinkee.com/articles/richard-mille-sets-a-new-record-for-the-worlds-thinnest-watch-with-the-rm-up-01-ferrari https://www.hodinkee.com/articles/richard-mille-sets-a-new-r...