Yellow dumped warbler 600ef + 1.4x at 1/2000 iso 800 5d miii.
Decently sharp handheld.
I like seeing the little bumps around a birds stye and the individual hairs on the feathers as my judge of sharpness. Of course in flying images ......
AE-1, T90,EOS Elan 7e, EOS-M, 7D, 5D3, 1dx, ef40 2.8, ef 85 1.2ii, ef100 is 2.8 macro, ef300 2.8ii, ef400 2.8ii, ef600 is ii usm, ef8-15 f4, ef16-35 ii, ef24-70 ii, ef 24-105, ef 70-200, 2xext ii, 2xext iii, 1.4x ext iii.