The Zeiss Batis 85mm f/1.8 and 25mm f/2 have been profiles on the review site Digilloyd.com. The photography site has posted the MTF charts for both lenses, and made some conclusions about the yet-to-be-announced lenses based on the objective data data described in the charts. Generally speaking, the analysis from Digilloyd shows that the Batis lenses should be rather exceptional.
An MTF chart shows the contrast and the resolution of a lens at various aperture settings across the imaging surface of the lens from the center outward. (Most lenses tend to be sharper in the middle than at the edges.) About the 25mm f/2 the site concludes (among other things)
However, overall contrast is superb wide open, even into the corners, and that very high overall contrast is critical to visual impact of the image.
Most notable, the performance is exceptionally uniform at all apertures from center to corner. This is highly unusual for a 25mm lens.
and about the 85mm f/1.8
The MTF chart shows excellent micro contrast wide open at f/1.8 with highly uniform sharpness corner to corner at all apertures. Overall contrast is superb wide open, even into the corners.
Peak performance is reached at center by f/2.8, but the variation (wave inflection) across the field looks to be a mild field curvature; stopping down a bit more delivers outstanding micro contrast at f/5.6, far exceeding most lenses and no less good than the very best Leica M lens. Minor astigmatism is present.
The less scientific take-away is that the 85mm may be on par with Leica lenses and the 25mm might have some of the best corner sharpness on the market.
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