That mentioned, there's this: The Lumix 20/1.7 vignettes. A whole lot. And the 14/2.5 isn't sharp in the corners until at least 5.6. I'm guessing that it focuses the corners somewhere other than the "film" plane. Also it has a tiny bit of barrel distortion. Sigh.
Guessing. I suspect that going MFT from 4/3 put optics too close to the sensor. And aspheric and all the rest can't quite make a decent lens that is the inexpensive money a fella would want to pay, if he could.
In defense of Lumix, Leica made some stinkers. The fifties and sixties had three or four really good, but kinda slow, lenses. And a whole mess of lenses that were okay, but at Leitz prices. Then they figured out how to make the Summicron. That's another story. Another time.
No potato. Here's a poodle -
-end-
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