Sharpness of static subjects is one thing, but getting keeper with (fast) moving subjects is an entirely different game.Sorry to pick and split hairs...but no the ef 300mm f2.8 II LIS is not THE sharpest Canon ef lens ever made, just ONE of the sharpest ef lenses Canon have ever made. It might be the sharpest lens that you won. However, the ef 400mm f2.8 III LIS technically slightly sharper. This is only really seen when fitting 2x teleconverters. However, produciton variation could easily make one 400IIIL slghtly softer than another 300IIL. Then there's the whole AF accuracy question that can easily make one lens appear softer that it really is.
A couple of weeks ago, I shot an endurance motorcycle race using the EF 300(+1.4x TC), EF 200-400(w/o extenders), and the RF 100-500.
The Big Whites soundly wiped the tarmac with the RF lens: the EF's hadn't a keeper rate of 17.x %, and the RF was at 8.x%.
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