I bought my SF10 with a pair of probably the same Magnicon lenses about the same time from Blacks.
The lenses will work. However, the quality does leave a lot to be desired. I had bought the K10D body with the thought to using these older lenses to save some money. I took the 70-210 out for a golf event, and was mystified at the inconsistency of the lens. It would take a few good photos and then it would simply fall apart in quality. For the 123 shots I took of the event. I was just never sure what the results would be from shot to shot. I quickly bought the 16-45 and 50-200mm Pentax lenses after this event.
Here are a few examples of what I didn't like about the lens.
1. Purple fringe. The odd thing was that it would purple fringe inconsistently. Some of the photos turned out well, and others turned out like this example. Even when I took several shots back to back with the same settings, I was not guaranteed a fringe. I still haven't quite figured this one out yet.
2. Be sure to use a lens hood at all times. This lens is the worst I have seen for this behaviour. Unlike the fringe, I could consistently get this sort of photo with the sun anywhere in front at any angle.
Yes, the lenses work on a digital body. They just aren't as good as I remember them with film. Your millage may vary though.