Sigma f/1.4 AF Issues
Your needs may vary, but I am fine with slightly slower AF at a considerable savings, hopefully with less obsolescence risk due to the ability to change firmware via the new dock.
In reality, most of the time I am not cycling back and forth between minimal focusing distance and infinity, and if the time from 4 meters to 8 meters is fast enough, fine.
I will let you know real-life results in a week or so. I plan to use the lens for a wide variety of shots, but I don't do demanding action photos aside from telephoto wildlife photos.