A screen clip at 100% from Nikon ViewNX showing focus point deliberately tested on the water considerably in front of the subject, now note how the tree branches and the Heron are sharper than the reeds in the background. The lens is Sigma 18 - 250mm f3.5-6.3 DC OS HSM
Nikon D5000
,Sigma 18-250 f3.5-6.3 DC OS 1/750s f/6.3 at 250.0mm iso800
hide exif