I would have to agree, the Takumars are a cut above in my opinion, but being honest with you I shot m42 for years and a good majority of the lenses back then were fantastic performers, and now a days are only a song in the cost department, I have always shot wildlife and big glass was a needed thing, I had a large Pentax 500mm that was as good as anything I ever saw from Nikon and Canon in the same time period...

Many of the rebadged lenses that were sold under the Sears, JC Penney and even Kmart brand lables were great performers as well

Dave