YSL Rock'N Red (8) is a cool red with a luminous finish that is limited edition and retails for $38.00. In comparison, Chanel Rouge Vie Radiant (138) is a cool red with a satin finish that is limited edition and retails for $40.00.
Chanel Rouge Vie Radiant (138) is 90% similar — it is less shimmery, warmer, less glossy.