At first I wanted the new version of the Canon 100-400, but it is about 3 times as much as the Sigma, and I have read and viewed quite a view reviews before I decided to test the Sigma and save my money for the new Canon RF lenses, because for the L lenses you always need the adapter, which maked the lens even longer ;)

Because I have never had a lens longer than 200mm before, I will have to practise to get used of the weight of the 600mm, and use a monopod, lay down etc - the more I shoot with it, the steadier it will be :)