A culture victory is slow now. I won a culture game with France on Emperor, I got there but it took ages, and that in a game where everything went my way - got all of the culture wonders, never attacked, minimal competition for City States. Early policies came very fast, but the last ones cost a fortune. I stopped one game on the way to a clear tech victory as Rome because it was taking too long. However, domination may be feasible even faster.. I'm trying with Japan atm, and the big buff to Honor is a huge help. Culture comes much easier earlier from the base policy and garrisons, allowing you to go Honor only. The happiness from military buildings is letting me keep on attacking and expanding where in the past I had to pause to get happiness reasonable. XP buildings with lower maintenance and and cash for kills mean money doesn't become impossible either. I'm hopeful this will be my fastest domination at Emperor, though time will tell as I'm yet to take to the seas and ma playing continents.