I just won this Schneider Xenotar 135/3.5 on eBay. There is also currently an auction for the Carl Zeiss Planar T* 135/3.5, but it's already over $100 more than what I paid for the Xenotar, and non T* versions have sold for over $1500 in the past, so that's well out of my price-range. They're supposed to essentially be the same lens (minus the coating), and I haven't seen any evidence that the Planar is sharper. (There's also a Xenotar 240/2.8, but that's $1500 buy-it-now).
I look forward to enjoying the lens. Eventually, when I get some photos with it, I'll tell people how it goes.
Its reported resolutions are:
f# ctr mdl edg
f/3.5 20 ? 10
f/8 60 ? 30
f/11 42 38 42
f/16 60 60 54
f/22 54 54 54
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