Here is a non scientific test conducted for 3 lenses. I try my best
to be as fair as possible. All the shots are at f5.6, 50mm, focusing at the red shirt centre line. Using the same camera and settings and no PS done. The purpose is to see how sharp your eyes are to differentiate sharpness. Of course if anyone find this thread meaningless, just skip and go, and sorry to have wasted your time. It is purely for the fun of it.
1)Nikkor 18-55mm f3.5-5.6 (D50 kit lens)
2)Tamron 17-50mm f2.8
3)Nikkor 50mm f1.8D
Which picture you think is taken with 1, 2 and 3 ?
100% crop of A
100% crop of B