[borisbg]

JoJu, If you already use AF, don't even bother with MF. It requires skill and good eyes, and for better results you will need focusing screen. It can be really frustrating some times and at F1.4 it is even harder. The focusing dot in the OVF is not 100% correct, but it helps. You mentioned moving birds... this is hard with MF lens. I believe this lens should be used in controlled environment where the subject can remain static during focusing or you can always re-take the shot.

Don't tell me you will buy the Zeiss if it is noticeably sharper than Sigma?