if you want to get "technical" with cocktail "names" a "
perfect" martini is 1:1.
if you order a "perfect" martini at any of the "reputable" cocktail bar (by reputable I'm talking places like Pegu Club, CLover Club, PDT, Milk&Honey, etc in NYC Absinth in San Fran, even 7 grand in LA for you BDL) you'd get (hopefully) a 1:1.
otherwise known as a 50/50....
here is another article on the "perfect" martini by Robert Hess
DrinkBoy: The Perfect Martini