Your in for a surprise if you didn't know about the final gather settings. The lighting looks a whole lot different once you turn final gather on. If you don't know much about how to set final gather here are some helpful tips. Start your FG rays around 500 or lower. Your min sample level should be 10 percent of your max level ( 20/200 for example ). You get the idea. Now with final gather, your render times wil increase quite a bit depending on your image rezolution. My 825x 480 stuff takes like 15 mineuts to render. Trust me, MR renders can be alot cleaner than the Maya software renders.

Best of luck !