User.82148
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No it is not fair to say this lens lacks contrast! I also own a 500f4is and looking at similar images together I would never say the Sigma lacked anything in good conditions and especially not contrast. If you think 100-400mm is long enough look at the Sigma 100-400 by all accounts it is sharper than the Canon and a lot cheaper.
For what you want it for look at the weight and price of the S compared to the C,the Sport is not really hand holdable for long periods or really a carry about lens so you have to be prepared to use a tripod or monopod which will go off balance every time you zoom in or out. I have done weekends roaming Brands GP circuit with the Sigma 150-600C and days photographing flying Hobby's and have never needed support. The people I know who bought the S version hate the weight, as for weather sealing a lens cover sorts that out and most people will use one on any lens. I am sure S owners say it is sharper but I have never seen anything to prove it in the real world and my C gives my 500f4 a run for its money, but f4 is needed sometimes.
Interesting post. The only downside with my Sigma 150-600 C is the lack of f4.