I've known a gelding who was very sharp but a mare who was very easy going. Sorry is this isn't very useful - just shows that the mare also has influence. Both were very talented but under 16hh.
I had one, he had a wonderful temperament. When I took him to shows, he'd fall asleep on the lorry, wake up to do his dressage \ sj \ xc and then fall back to sleep again. I'd say he was perky to ride (like an overgrown pony) but not sharp.