I bought one to see if it can shoot radio control events and the season is finally here. Weather was very dull most of the day until the rain arrived as per the forecast but I did get to try it on both my 1D4 & 7D2. Lens has the original firmware it was shipped with & that's where I wanted to be for my first test. When I bought it Sigma Canada had a special on which included getting the dock free using a mail in /or email coupon which was the incentive I needed because new firmware had been announced which should be good for my needs. As time goes by my panning will get back to par (I'm rusty from the winter off season) & I'll be fine tuning the lens if I feel a need but I have just upgraded to the new firmware for this weekends event. Samples are from jpg's with minor exposure adjustments but only in camera sharpening. I do shoot large fine jpg + RAW but rarely use the RAW for the event albums (which are on line at a low resolution for sharing). RAW's get used when a print is needed or when sent for publishing which isn't that often & it's usually in a non profit magazine I supply photos to, but last year a few were used in a couple of major publications. First 3 are from my 7D2 then 3 from the 1D4.