Loving this thread, especially Mr. Flibble.
I'm considering a Summitar (on a IIIa) but I don't know if I'm going to get any important improvements compared to my Elmar & Jupiter-8.
Maybe just a IIIa body...
I have all three of those lenses. The rendering of the Jupiter is quite different (Sonnar vs. double-Gauss). The Elmar and the Summitar are definitely cousins, with the sharpness edge going to the Elmar (if that matters to you). I use both of the Leitz lenses regularly and find they both have their charms. The Elmar's compactness is a great feature (especially on a Barnack), but the extra speed of the Summitar gives useful flexibility, and I absolutely love the Summitar's rendering at f/4.
1949, coated, 9 aperture blades - wide open
1949 coated Summitar (10 blades), IIIg, HP5+ in Caffenol C-H(RS):
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Very nicely done.
br
Philip