For what its worth I own a Canon 70x200 L f.4 and a Canon 100x400 L
I recently rented a 70x300 L for a weekend wondering if I would get a "two for the price of one" compromise.
Sadly my answer was no. The 70x300 is a wonderful lens. But like the 100x400 it needs good light to get the best from it. The sweet spot I found at f8 but despite a damn good IS system hand held shots in typical gloomy Spring days in the UK found it wanting as does the 100x400
I was unwilling to let go of the extra focal length of the 100x400 for no real benefit
...........and I have always loved the 70x200 anyway.
So the rental 70x300 went back and I remain with my two lens that have justified their place in the camera bag
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~John~
"It ain't what you say - it's how you say it!"
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