I own the Riki in chocolate brown. As previously mentioned, the Riki is just a smaller version of the Ramona. I have to tell you, it is really luxe looking and feeling. It is truly one of the best purchases I have ever made. Because I am only 5'1" I was reluctant to get the larger Ramona, but if I had it to do over, I would go with the bigger of the two bags. I find that I now that I have made the transition to larger bags, I tend to carry more stuff.
The Ramona does come in patent leather. Patent is very hot this season.
Try on the Ramona and the Mahala at the Jimmy Choo boutique, take out the dunnage, put your stuff inside. Closely examine the design features, ask yourself if there is anything about either style that would bug you; from there you should be able to make your decision.
Jimmy Choo makes extraordinary bags. By year-end I am hoping to add two more bags to my Jimmy Choo collection, for a total of four.