Now recommendations for 40mm EFOV lenses for GXR-M

I have read all the recommendations for the 50s (75mm EFOV) lenses and will have a great opportunity to test the following next week:

Asahi Super Takumar 50mm f1.4
· Fujinon EBC 50 mm f1.8
· Fujinon 55mm f2.2
· Zeiss Tessar 50mm f2.8
· Rikenon 50mm f2
· Helios 58mm f2 (a great lens, my friend says).

Now, I would like folks' recommendations for 40mm EFOV lenses for the GXR-M module because, like other posters here, I find that focal length very comfortable.

TIA, kl
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Kit Laughlin
http://www.KitLaughlin.com/ , http://www.KitLaughlin.com/bodypress/