Let me toss another iron on the fire...
I have the RF100-400 and even with the RF 1.4 on it I find it acceptably sharp to me, also SO MUCH LIGHTER than my 100-400!!
I do like the kit I have except for two things the RF 600/11 can't zoom and often I clip wings if the birds are close also when the are against the sky and a ways away it can struggle for focus.
The 150-600c, well for the DSLR it is ok although soft at 600mm and with the mirrorless it is useless less than 50 yards due to focus hunting.
I know I said I was considering the 100-500 but with 2 DSLR's that I am not getting rid of and my son having a 50D and 80D I want to keep some lenses for them.
I am on the fence again on the 200-800 leaning towards it, of course that is why I have too much gear!


