Sounds like in GTA V you are CPU bottlenecked, but there isn't a faster CPU out there for gaming. As I said before, either CPU or GPU will always bottleneck the other, the point is to get your framerates sufficiently high.
Depends on what you mean. One will always bottleneck the other or your framerates would be infinitely high, but there simply isn't a better gaming CPU, so...
In what way? A cpu bottleneck while gaming? Of course not. That is the most powerful cpu on the skylake platform ATM, why do you think its going to bottleneck?
Sounds like in GTA V you are CPU bottlenecked, but there isn't a faster CPU out there for gaming. As I said before, either CPU or GPU will always bottleneck the other, the point is to get your framerates sufficiently high.