you really should bear in mind that most stages dont look very spectacular when they are not in action and the hall lights on. esc is made for tv audience, tv pictures do matter, visuals and light concepts, camera positions (and there will be more cameras than in copenhagen) but not how the stage looks in an empty hall. and the stage is not much smaller than in recent years (copenhagen for example was only 13m in height, but of course the back led screens much wider, dusseldorf stage was a bit smaller in diameters....).
copenhagen for sure will not be beaten for a long time. but on the other side it is poor if everything is concentrated on the stage and lights. the opening in copenhagen was very poor- dancers waving with flags..... how innovative! hope in vienna the programm will be more emotional. that counts more than technics.