Kind of. I see the Maserati more in the class of the Audi A8, BMW 7-Series, and the Mercedes S-Class. I see the M5 in the class of the Audi A6, Mercedes E-Class, Cadillac STS, etc. The M5 is a step up in performance compared to these other vehicles so more accurately it would be M5 vs STS-V vs E55 AMG vs RS6 etc. The Maserati seems to compete with the S500, 745Li, Audi A8 L and seems to be the sportiest of the bunch.