As an owner of the older EX version, I find it curious that TDP claim the new one is "sharper". All the info we have suggests nothing has changed optically. Lensrentals even pulled them apart and the optical modules appeared identical. Is this "sample variation" at work?
Canon 1D, 300D IR, 450D full spectrum, 600D, 5D2, 7D, 7D2, EF 35/2, 85/1.8, 135/2+SF, 70-300L, 100-400L
EF-S 10-18, 15-85, MP-E 65, Zeiss 50/2 macro, Sigma 50A, 150 macro, 120-300/2.8 OS, Samyang 8mm fisheye