I do not care for color of the lesnes, or 70mm vs. 100mm at the short end or for any Sony lens, since it won't mount on my Canon camera.
All I want is an improved Canon EF 100-400/4.0-5.6 L IS Mk. II ... rotary zoom design, fully sealed, better IS, better image quality at a similar price to the current 100-400.
I will not buy the old push-pull one version. And if the Sony 70-400 is really good IQ-wise, I may get the Canon lens sooner rather than later. :-)