[Leica] 90mm APO Summicron-M?

[Jim Laurel <jplaurel@microsoft.com>]

Does such a lens exist?  I think I've seen it mentioned in some posts here
on the LUG, but it isn't listed on the Leica site.  Is this lens rumour or
reality?

Sorry if this has been discussed before, but I've seen reference to this
lens in some other posts and thought I'd ask...  Of all the lenses that I
use on my M6s, my Summicron 90 (Midland) is the weakest in terms of imaging
performance.  At infinity, it's great, but I can't seem to get the same
calibre of results as from the other lenses at closer focusing distances.

Best to all,
Jim Laurel