there was some mentioning of Soligor on the second page of this thread, but not too many lenses presented yet.
I have a Soligor 180mm f3.5:
some more shots also mostlty at ISO 800 in this set:
Soligor 180mm f3.5 - a set on Flickr
I once did a small test against the S-M-C Takumar 200mm f4:
http://i39.photobucket.com/albums/e1...centrecopy.jpg
or in words I find it sharper than the Tak 200/4, specially at wide apertures, and it is lighter and faster.
Because I liked this lens I later also got another old M42 Soligor preset with the same 'face', a 25mm f2.8 lens, but I found it just average.