Readers here might be interested in this thread, where a couple of Forum regulars are posting the results of their first experiences with the lens (ie over the last few days). Those 1st impressions seem very good, taking into account the size and price:
Canon RF 100-400mm f/5.6-8 IS USM: First Impressions
Canon RF 100-400mm f/5.6-8 IS USM: First Impressions
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