The SL66 is a wonderful camera to work with. All my lenses are older non-HFT ones and so far I have not run into any problems with flare, but I am careful to always shoot with a lens hood in place.
These two photos are from my recent exhibit of black and white portraits. Both were shot with the 150mm Sonnar lens which Iíve found to be extremely sharp. With a high powered loupe I can easily read the date and time on the digital watch that the man in the family photo is wearing. Itís even possible to make out the fibers of the watch band.
Enjoy your new (to you) camera!