The Difference Between Good Hitters & Big Leaguers
The most distinct difference about Big League hitters is that they are able to make adjustments in one pitch. They have extremely developed "feel" for their swing, and are some of the most special athletes in the world. Their quick twitch muscles and hand-eye coordination is incredible. These attributes paired together allow them to audit their swing in between pitches and make an adjustment on the very next offering from the pitcher.
In addition to that, they are mentally rock-solid. They recover quickly from failure, and pound their craft until mastery. Big leaguers stick to a strict regimen and reverse engineer their success with the end results in mind.
Most of all, the greats are obsessed with the process, which drives consistency and success.