It is not a stretch that Vazquez might be the better overall catcher between him and Leon. This is not to knock Leon, of whom I'm a big fan, but Vazquez sat out a year due to injury and then was rushed back.
Vazquez' defense in 2014 was superb, albeit in a small sample. However, Vazquez had superb defensive numbers in the minors as well. For those who aren't a fan of numbers, he was highly touted defensively by the scouts as well. He had a reputation as being an elite defender, and that reputation was supported by the stats.
Vazquez' injury caused a set back. Whether he can overcome that set back and return to his elite status remains to be seen. However, thinking that he can be a better catcher than Leon is not a stretch.