Look up this comparison:
http://www.biofos.com/cornucop/telecomp.html
If you want something cheaper and lighter than the Zuiko 50-200mm,
you might consider the Zuiko 40-150mm. I have both, and I can attest
that, although the 50-200mm is better, the 40-150mm is an excellent
lens, and much easier to carry in your bag... If there is enough
light, it even works well with the 1.4x TC.
I have never used (or even seen) the Sigma lens.
Bernard
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