I just used it this morning for football with the 1.4x. I probably won't be able to post examples for a few days but I will as soon as I can. I used it on a 7D MkII and it seemed to focus pretty good. My photos were sharper and the focus was faster without, that's a given, but it was still usable with the 1.4x. I used it for a while and then finally decided to just shoot without it and crop the photos later. If you need the reach, a 300mm lens will always be better than the teleconverter.
I would agree. It does take a small hit on IQ but AF speed I never noticed any loss even during night games. I do prefer to shoot without the TC but if your looking for 300 the MK2 cannot be beat. That MK2 is top notch and handles any TC great.
But I have dual purpose for my 200/2... portraits/indoor at 200 then outdoor w/ the 1.4x. My alternative would be a 70-200 and a 300 or 400.
It has been said... whatever length you think you need... get the next longest.





