28mm summicron observation/question
I've picked up a 28mm summicron 2nd hand and have questions. On film, it seems to be best wide open and in the close to middle distances. Stopped down, it appears to make nothing stand out as being sharp or particularly clear from middle distance to infinity. I've compared it with my old voigtlander 28/3.5 and 28mm biogon and both seem better in daylight, except for flare resistance.
Apples to oranges, but my 50 lux v2 is much sharper wide open and stopped down.
Is that common with this lens, or do I need to send this one to be checked?
Thanks for the thoughts,