Which one is sharper, Tokina 100mm or Sigma 105mm F2.8 EX DG OS HSM?
Tokina gets 19 P-Mpix on D800, but only 15 P-Mpix on D3X
Sigma 105mm gets 17 P-Mpix on D800 and 16 P-Mpix on D3X
How do you explain this? Is this due to sample variation among different lenses or what is a reason that one lens is sharper on high-Mpix camera and another on lower M-pix camera?