obviously hes improved, hes arguably the best qb in the league...as opposed to just one of the pretty good qbs in college.
Ive watched cal football for years now, and his mechanics wasnt all that different from him holding the ball high close to shoulder and because of that he was coming off snaps weirdly. it was like one thing that looked weird and he corrected it.
otherwise his mechanics werent all that fukked up.
He had a great situation. Had weapons, and able to learn behind and a great coaching staff. The year before he started, they went to the NFCCG and was an INT away from the Super Bowl.
49ers was a terrible situation when he came out the draft. No weapons. Terrible OL. Average coaching. Most QB's can't survive that.