As the last post states, you can get a good or bad copy of any lens, especially now when you've no idea how they were treated by previous owners. I have the K series (essentially SMC Takumars with a K mount) versions of that 28mm f3.5 and 200mm f4, I rate the 200mm higher than the later M or A series versions. It produced a moon shot a couple of weeks ago which showed plenty of detail after considerable enlarging.
The 28mm in my experience is just a brilliant wide angle lens, very little distortion and not horribly soft wide open. Shoot it around f8 and it's pretty much focus free. My 200mm is minty while the 28mm has a fair bit of paint wear but perfect optics.