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What do you think?

Is the Canon 28-300L (from 2004 if I'm not mistaken) a safe buy or will some update or new 'super-zoom' be seeing the light of day anytime soon?

(It's a heavy investment, for me at least, if a new version is close. And I obviously wouldn't like to make a wrong move with this kind of price-tag. I'm looking to fit it on a 5D3)

Thanks in advance, and happy 2015