Through some luck I have been able to pickup a Minolta 70-120 F4 (the venerable Beercan) and add it to my kit... however, as I already own the Sony DT 18-250 I find myself wondering if I even need this extra lens? I have used it, but not sure I am seeing any real benefits from it.
(The only other lenses I have right now are the kit lens and a prime Minolta 50mm 1.7 - which is nice for indoors without flash).

There are many pros for the 18-250 - wider, longer, lighter, smaller -
But only the constant F4 seems to be a pro for the Beercan.
Should I bother keeping it, or sell and put the money towards something else like a CZ 16-80?

What do you all think?