Just curious, is that with auto focus....
Auto focus always, for the time being. I can't focus manually due to an ongoing eye situation with my left eye. I had a botched-up cataracts surgery back on May 2nd. It will be corrected in August hopefully so in the meantime I am totally dependent on the auto focus feature of my camera and lens. This shot was taken with a Nikon D500 & Sigma 150-600mm Contemporary. (I love this setup)
The reflection on the eyes is so sharp
Actually I wanted to try something with this rabbit's eye. In the orginal image, except for the reflection, the eye looked somewhat dull. I put the image in Gimp to isolate the eye and lighten it while also increasing the contrast so as not to wash out the color. It worked so well I left it. You have to look very closely to see that the enhancement of the eye is what gives the appearance that the rabbit is so sharp. An illusion! Nevertheless, thanks to everyone for the kind comments.