I'd much rather buy Nikon's upcoming 600 f/4 with possible 1.4TC built in than this 800/5.6. I'd never even consider an 800/5.6 lens and especially would never buy this 1200/8...in that case I'd rather buy the 800/5.6 and use a 1.4 to get 1120/8. These are such super specialized lenses and as pointed out up thread do have their use cases but still such a weird move by Canon. Where are lenses like 500/4 and 300/2.8? Or better yet more unique stuff like fast DO lenses or interesting zooms?Somehow they look shorter than I'd expect. Perhaps the objective lenses are just so darned wide that it gives that impression, and I'm not thinking in the right scale.
I will be very interested to see if the MTF graphs that'll come out on launch compare favorably to the 600mm with a 1.4x teleconverter. To launch this sort of a monster I suppose it must.
Also curious about the 800 + 1.4x TC versus the 1200 f/8. If the 1200 doesn't beat the pants off the 800, then it's just a lot more bulk to carry around.
Big "whomp whomp whooomp" to Sony wildlife shooters for the next bunch of quarters before they can marshall something equivalent. And for the next few years for the Nikonians, who have a better chance of getting something from Sigma or Tamron in terms of big pro lens release timing.
Sony will never make lenses in these focal lengths....Nikon will have its 800/6.3PF and 600 with built in TC to satisfy a similar market. I don't know any wildlife shooter that would be so interested in either of these lenses to move systems but I'm sure there is someone out there. Prices are going to be insane for these.