I have 100/2 and 200/2.8 and they NEED replacement - 100 have horrible purple fringing, 200 needs IS.
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16-120 sounds interesting but I am more interested in
(1) a f/4.0 zoom, e.g. 15-75mm with GREAT IQ and a
(2) f/2.0 40mm compact lens (with telephoto construction to minimize size) with GREAT IQ, IS and a good close focus capability (1:4 would be sufficient for most purposes).
But that's just my "needs" ...