I’ve been using the 7d (Mark 1) with 70-300L for sons soccer I honestly cannot fault either the lens or the 7d’s tracking - pretty much 100% reliable, it’s me that gets it wrong BUT - I really would like smoother images. Would I gain anything by using the 5dii (centre AF spot) then cropping more than I do with my current set up? ive had no complaints at all - the parents constantly gush about the pictures, but I honestly think it’s only because they compare with what they get with their smartphones. Or would selling the 5dii and either buying the 5diii or 7dii be better. Do not want to change lenses, the 70-300L is heavy enough.