Just found out that my Sept 2022 acquired new Sigma 150-600C has an unknown version of firmware installed because don't have a dock to check it. I contacted Sigma for an answer and got no straight answer of knowing my piece version unless using a dock to check/update (serial # won't help). Also got an answer for calibrating the lens: "There is no need to calibrate the lens for the mirrorless system". Heard that updated firmware does somewhat improve AF performance. Also, the dock can tweak some AF settings... So coming down to the question: Is the USB Dock a must for my system (z6ii + FTZ + Sigma)? If yes, a used one be good? Appreciate your input.