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The Canon 40/2.8 STM. What's not to like, it's cheap, sharp with good character, super-small, and has accurate AF!! How can you go wrong?
AF is how it goes wrong. i know i'm in the minority on that though.
Isn't the Zuiko $400-$600?
And doesn't it only have 5 or 6 aperture bladeds?
6 aperture blades if i recall correctly, it's the rokkor MD 45mm that has 5 and yes, the olympus is a bit over priced.
the minolta MD 45mm has nice color and center sharpness, but it's pretty crappily made and its sharpness drops off quite a bit towards the edges.
Leica made the 40/2 Summicron-C, yes.
Minolta made the 40/2 M-Rokkor in both single and multicoated versions, and IIRC, it is the same optical formula. I prefer the look/build/design of the latest (CLE version) m-rokkor. I've had two copies, and on film, at least, it was excellent.
the m-rokkor has the advantage of normal filter threads instead of the obnoxious series 5.5 filters and (at least i'm told) multicoating. the leica version probably has different colors than the minolta due to coatings, but minolta and leica colors were always pretty similar. the leica one comes with a little bit of a leica tax too... they usually run about $200 more than the m-rokkor. i've only shot the leica version, but it is one of my favorite lenses.