Thanks for your very relevant comment.
We made the choice to specifically focus in this comparison on telephoto-zooms with a maximum focal superior or equal to 300mm.
Fix focals of 300, 400, 600 or 800mm type, whatever their brands, are indeed well-indicated for wildlife photography. As we already have some long focals in our database, this kind of lenses will be tackled in further comparisons.
The lenses you suggested are very relevant and we are going to add them to our list. In this regard, we welcome any suggestions of yours concerning other lenses we might include in ours reviews.