Canon 100-400 ii with Canon 1.4 or 2 X TC ?

Hi Guys, just a quick question to ask how are people getting on with this lens with either a canon 1.4 mkiii or 2x mkiii tc's.
I will be using it mostly on my 1DX mki
Will it still auto focus ? and will i lose much image quality ?
I have a 1.4 mkii tc, and 400mm F5.6, but find it a bit restricting without IS at slower shutter speeds, thats the only reason im contemplating buying the 100-400 mkii lens.
Thanks.

Little IQ loss for both TC's. I'm pretty sure the 2X will not AF. You need an F4 or less lens.

digital paradise wrote in post #18647486
Little IQ loss for both TC's. I'm pretty sure the 2X will not AF. You need an F4 or less lens.

There seems to be some technological cliff between f/8 and f/11 for PDAF. Many older cameras which only officially support f/5.6 can actually PDAF at f/8 when tricked, albeit slowly and requiring good light and contrast, but I have never heard of f/11 optics successfully PDAF-ing in OVF mode with any Canon camera, at any speed, regardless of the amount of light and level of contrast to focus on. f/11 AF that worked well through the viewfinder would be a game-changer. I don't have any of the top-tier f/8 Canons, but the center point on the 7D2 can't even see when the lens is in focus, and just goes beyond it, and stops, even on stark B&W lines in the bright sun.

Of course, live view sensor AF works just dandy, if a little slow, at f/11.