« on: April 09, 2014, 01:32:11 PM »
Don't see how this could be viewed as anything but a winner if it comes in around $1,000 USD. Zeiss is better wide open across the frame - that's hard to do and you pay for it. But for 1/4 of the price this performance looks to be awesome.
Is better or measures better? Zeiss used to be known for sacrificing resolution for micro contrast... the Zeiss look was "punchy." Sharpness isn't a matter of resolution extinction; it's a matter of area under the MTF curve and the Sigma appears to have higher MTF at low frequencies so better acutance overall.
Are there any photos taken with this or just test charts? Zeiss has a near apochromatic design with the Otus and yet they manage smooth bokeh, which is unreal. Smooth bokeh is usually associated (as with the old Sigma 50mm f1.4 and my beloved 135mm f2 AIS Nikkor) with spherical aberration and spherochromatism so the "pure" color of the Otus along with the soft out of focus falloff is really unusual and does impart a unique "look."
Who is actually shooting low light landscapes with high frequency detail at f1.4 and then printing huge... does anyone actually care about the corner resolution at f1.4? No. Acutance matters more, but still not as important as bokeh and CA. Sharpness is clearly on par with (subjectively probably better than) the Otus and FAR exceeding others. It's the rest that will be interesting to see... Including AF performance.
18-35mm f1.8 and 70-200mm f2.8 II IS both have surprisingly good bokeh and not much spherochromatism... this might be a nice complement for those two. Hoping...