Well, the unicorn has been released.

I have been looking at the MTF charts.

Original 100-400L @ 400:

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New 100-400L II

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New lens with 1.4TC

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First, black lines are supposed to be wide open and blue @f/8. So I am not sure why there is a difference with the 1.4TC. At this point, for the 1.4TC chart, I am assuming that the black lines are f/8 and the blue @ f/11. If anyone knows better please let me know.

It looks like a great lens. As Canon has been doing with recent lenses, it really looks like they are increasing contrast and providing some very high resolution zoom lenses. The 4 stop IS, minimum MFD, and, I assume, faster AF are very much appealing.

But, as I am looking at the MFT charts, I am not sure I am going to sell my current 100-400L, spend another ~$1,300, to upgrade. I think I may be waiting for Bryan's review. I have the 150-600S pre-ordered, mostly to try it out, but going over these MTF charts, my current sense is that the 150-600S may actually be better than this lens from 300-600 mm, which is what I care about. Please, let me know if you think differently as I am very much on the fence.