So in this case graphics got bigger, like Acert said, instead of better. Or at least that´s how I see it.
Capcom already said the final game will look a lot better.
So now, the graphical quality of the zombies is a lot less than what we want since we want to get as many zombies on-screen as we can. But I guarantee that in the end the game will have a lot better graphics with all of those on-screen zombies.