I agree with your comment as I went through this 6-7 years ago, owning and using both a CFi/4 and C/5.6...on paper the MTF favours the C close up, agreed, but I ended up selling the C and still use the CFi. Reasons? I couldn't see the difference practically in my slides; the extra stop of light was a bonus and even more so the better depth of field seperation wide open; then there is the capacity for higher flare supression and contrast in strong light from internal flare improvements; lastly, newer improved parts and ergonomics. I think I've made previous comments that Zeiss is on record as stating that (at the time) the 120 makro planar has better colour correction than most makers' APO lenses (trawl photonet - Kornelius)...it makes very beautiful pics in all incarnations and though these days perhaps it may not be the last word in resolution, it is often underrated. Buy with confidence, I reckon.The old S-Planar 120/5.6 actually outperforms the Makro-Planar 120/4 at close-up distances.
Another feather in its cap...I distinctly remember some years ago Leica showcasing its ?S1 with guess which lens on the front? (Someone else may remember the details more accurately).
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