Here Bao, probably not the best example. But I took this at ISO 1000, Shutter 1/400th and Aperature of 1.8. You can see that her feet are somewhat soft or not sharp and if you look close enough you can see that the ends of the bar are also not sharp. This is because of the 1.8 Aperature, you have a very small depth of field where everything will be in focus and sharp. I could have gone faster on the Shutter, as you see there is still motion blur in her hair.
