This article doesn't focus specifically on fiction writing, but it offers an interesting perspective on learning and practice v. innate talent.
Why Every Kid Knows Maths: The Myth of Talent
Why Every Kid Knows Maths: The Myth of Talent
IstariI don't remember where I picked up this distinction, but I view talent as innate and skill as being trained. Skill can overtake talent, but there's no beating someone with both. I don't know how much talent exists in this way in the strictest sense, but I find it a helpful framework.
Dark LordAs a comparison, my younger brother is currently studying to become a professional cartoonist. When he started drawing for serious, he went from basic scribbles to way better than me in something like a year. No teachers, no instructions aside from whatever tutorials he could find online. Just one kid who decided he wanted to draw. That's talent.