Most road race sprinting comes at the end of the race w or w/o a leadout, so finding a standing start time might be tough for the guys mentioned. I think track riders are the closest as they frequently play position games going into the last lap and I have seen velodrome races where the riders are close to track standing and then going into a sprint.

I don't think I have sprinted from a stop but I frequently sprint out the last little hill on our daily ride. So far I have gotten up to 30mph with no leadout and starting from say 19mph, standing and pushing a 53/16 combo, I think cadence was somewhere around 120