Horizon will bé à great game( probably a 85-86 Meta) , but éven being totally différent than Zelda, and Zelda being Zelda( probably a 94-95), sadly Horizon will suffer from the comparison, though it could sell more.
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m