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I'm not saying the FE has bad bokeh, but I'm pretty sure my Contarex 50mm f2 Planars have smoother bokeh from what I've seen so far. When I get my FE55 I'll do a comparison.
A bit late, but here is a quick WO comparison of the Contarex Zeiss Planar 50mm f2 and the Sony Zeiss FE 55mm f1.8. I realize I need to do more tests.
The comparisons are at the Sony MFD, the last image is to show the Contarex MFD, which is much closer than the Sony's. Advantage Contarex when it comes to MFD.
At first glance the sharpness looks to be equal, but at 100% you can see that the 50 year older lens doesn't have the same micro contrast as the Sony, but it's a very slight difference.
When it comes to CA, considering the 3 aspherical elements in the Sony, and 0 in the Contarex, it's a bit of a mistery that the Contarex seems to handle CA better, at least in this shot. Both lenses are well controlled though.
As bokeh is subjective, I'm not going to comment on it.
Full sizes available.on flickr.
FE55 100% crop center sharpness:
C50 100% crop center sharpness:
FE55 100% crop CA:
C50 100% crop CA: