http://www.marriott.com/marriott-rew...ts/platinum.mi

Marriott Platinum status is reciprocal with Ritz Carlton Platinum status, however the benefits vary greatly across brands (from Marriott to RC and also within the Marriott family of brands).

Lounge access and breakfast are dependent on the brand; also resorts typically exclude breakfast for Platinum members. No free breakfast at RC, whether hotel or resort. You also will not get Club Lounge access at RC as a Platinum member.