100-400l is usm

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    100-400 L IS USM mark I - still worth it?

    Hello everyone, the title says it all. I would need it for wildlife photos (of course :)). At the moment I have a 70-300 IS USM (not L) which is very soft, not happy with it anymore and need to step up. Is it still worth to purchase the mark I version of this lens? The mark II looks like a...