I would get a Cla, these are lovely old cameras and well worth the cost of service, and ask the repair shop to check the focus, could be that in the past the camera has been banged or droped and put the adjustment out, These Tessar lenses are pretty good , I have three cameras with Tessars and even wide open the center is very sharp indeed, closed ton 5.6 or better then I would put it up against anything save one, the Ross xpress lens, I also have the same rolleiflex automat as you, dealer bought and serviced, and it just purrs,
Richard