I do not agree with elementary OS as best-looking distro. Imo this award should go to manjaro kde.
I've never heard of manjaro. Would you mind elaborating on why you think it's the best-looking distro?
The main reason is consistent looks. They have chosen to create a very flat ui, thats a good choice for enabling consistency. Flat ui happens to be the design trend nowadays, which makes it also fashionable.
Manjaro still managed to make the icons look distinctive enough to be useful. Further strong points are good spacing, good use of fonts and consistency throughout the whole interface. The file manager is more powerful than the file explorer from mswindows, but the gui is still cleaner.
This video shows some of the looks. http://linuxscoop.com/video/manjaro-15-12-kde
Manjaro offers a pleasant surprise to people coming from windows (like me). I have tried mint, ubuntu, elementary os, and manjaro but I feel manjaro looks like the most modern and advanced desktop.