When photographing koalas you don’t need a high speed camera to catch them in the middle of acrobatics. No, you need a high speed camera to catch the moment when they are not asleep!
This image shot with the Sony 135mm GM lens on a Sony A1, at ISO 100 f/1.8 1/250. Image cropped to eliminate distractions.
To demonstrate the sharpness of this lens, here is a 100% crop of that gorgeous face: