FF15 most definitely drew inspiration from Xenoblade Chronicles. It maybe a step or two above XBC in terms of graphics but originality and gameplay seems to favor XBC over FF15. Also with SE predictable and cliche plots recently; XBC also is a step above that!!! It's gonna be a good battle between these 2 rpgs. I think XBC will out score FF15 in reviews but FF15 will mosdef win in the sales dept. I predict XBC will sell between 1.2-1.5 mil units lifetime and FF15 will get >5mil easily
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