My doppelgänger??
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Thanks Kev. For me its the carrying, not the using. Any serious landscapes I do are always on a tripod so using the weight is not a big deal. But as I get older I think lugging a tripod, the 5Ds, 16-35 and say your Sigma (1800g!!!!!!!!, you nick name must Popeye!), blah blah a few kMs up and down dale is something I need to think about. Comparing your Sigma f2.8's 1800g to say the Canon f4 at 780g I don't see a choice here, especially given I'll be using a tripod and so f4 is something I can generally deal with with exposure.
Appreciate your input!