Update on the Sony AF : the AF is still really fast in real-life shooting, i used it to shoot my ~2yo daughter and the AF is snappy, if she is not running too fast then it can focus quick enough (combo : A6000 + FE 28/2), i use face detection because eye-AF is not available for AF-C on A6000 (it's avai on A6500, A7R2...). But again the AF is quick but not always spot-on, i do see some out of focus results but can't really blame the camera, my child move quite a lot
So i think the AF of Sony (body + lens) is really good, as it's advertised and as many shooters already confirm. Still hesitate to sell my Pentax gears to jump ship because Sony lacks small+awesome lens like FA77 which would match the small mirrorless body, someone review the TechArt adapter and it looks like the adapter AF is not that great