>From the three lenses you mention the K 28/3.5 is said to be the best (many
consider it to be the best 28mm Pentax ever made). I guess (and it's nothing
more than a guess) that it would have better flare control than the Vivitar.
Also, the S1 lens focuses "the wrong way". I guess that everything depends
on what you need the most - flare control and picture quality or speed.
regards,
Lukasz
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