ok let me clarify.

I have a 70-200 f2.8 A 'fast' lens.

I have a 100-400 f4.5 - 5.6.....not so fast.

Question. If I am at 200 and F8 on both lenses, will the 70-200 outperform the 100-400 or will they be the same?

Does that make sense?