I own a Tokina SZ-X 28-70mm f2.8 in an Olympus mount. I bought this lens new in the mid 1980's. This lens has always been a sharp lens and a very good performer. These were probably better lenses than the 28-80 that you mentioned. I would look for the 28-70 version, but it would probably be a little more money, and well worth the difference.

Dave