OK, here goes. This is my Canon FD 35mm 1:2 S.S.C. Click on the picture for more images of this lens.
ILCE-7
Schneider-Kreuznach Componon-S 135mm 1:5.6 12798962
135mm
f/16.0
1/60s
ISO 200
The test scene.
ILCE-7
Canon Lens FD 35mm 1:2 108215
35mm
f/8.0
1/200s
ISO 100
I took test shots with the A7 and the FE 16-35/4 and Canon FD 35/2 at f/4 and f/8. Both lenses were focussed at the taking aperture, in case of the FE 16-35mm that means Live View settings set to ON. OSS off, tripod, A mode, focussing with 5.9x magnified view and peaking set to mid. Imported in Lightroom CC with my default settings for sharpening and correction profiles were applied to both lenses as that's what I always do. I made a custom profile for the Canon 35mm correcting for geometric distortion and chromatic aberrations. White balance set with the WB picker on the mid of the grey table.
Center crop at f/4. Click the picture in your browser to cancel the scaling and see it in full resolution.
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Yikes! There is detail in the FE shot but also a lot of halo and loss of contrast. The CFD is excellent here.
Center crop at f/8
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Much closer now, it's a toss-up IMHO.
Upper-right corner crop at f/4
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Essentially same story as in the center at f/4, but notice the CFD's sharp decay in sharpness in the extreme corner. But the CFD is much better overall.
Upper-right corner crop at f/8
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Again it's a toss-up I think. Only in the very extreme corner the CFD gets a little less sharp.
See the full-res test shots
here and there's also
another gallery for the Canon 35/2.
The Canon FD 35/2 is the clear winner at f/4 except in the extreme corners, at f/8 I find both lenses equivalent and both will be able to produce very high-quality imagery. I must say that focussing with the Canon is a breeze while manual focussing with the FE lens remains a painful experience, mainly due to its dual-speed behaviour.