Think about school. In a PE class with students learning a new sport, all being taught in the same way and all learning by the same methods, even among the students that never knew anything about the sport before, you'll see a wide variation in rates of improvement. Sure, you could say that some people care more, try harder, but that doesn't account for everything. Take any class. Simply during the class, before anyone has time to go home and study, some people will understand the material easily and some people will struggle with it. Now, that's not proof that talent exists, but any explanation of the world that attempts to rule out talent or frame it as insignificant just seems so unlikely. It's almost like saying, "Well I don't think gravity exists, I think everything moves in random directions and it's just a coincidence that everything happens to move down all the time." You can't prove either theory, but I know which one I believe to be more likely.
Basically, talent exists, so why ask that question? Why? Does it make you feel better to think that the world is fair, that everyone who is better than you at anything must have put more effort into it, or learned from a better teacher, or something like that? I mean, I can answer that question for you anyway. Talent exists, and in everything you do, there will be people more talented than you, and there will be people less talented than you as well (unless of course you happen to be... -the one-). So why ask that question? Instead, why not ask this question:
What can I overcome.
