Yeah, pictures make them look horrible but in real life I think they're sufficiently blingy that the shape isn't too noticeable. Since Shimano started down the hollowtech II route, it's all gone to shit, looks wise. Ultegra 6700 cranks are passable but I think that's down to the darker ano.
I was just going to say that 7800 cranks look like 4600. Definitely do not want. Spoils the entire groupset for me...