I dined at the Murano in February. Can't really tell you the size of he lobster because it is served cut into pieces with a French sauce over the top.
That said, the lobster is but one option of a 5-7 course meal, depending if you purchase the wine pairing or not. Yu will not be leaving this place hungry or wanting another lobster tail. Trust me.
I don't like paying extra for specialty dining, but Murano was incredible. Enjoy !!