Well what i meant was that the percentage of keepers are definitely more than what i expected and definitely more than what he has thats for sure. There are alot of factors, like how fast the AF is and also how is it able to track the cars at high speed, small things like that, and by weighing all these and using it and using his also, you get to see why the L lens cost more and the result turned out the way they turned out to be.
Overall, L lens is what you pay is what you get, though i have to say, its a little steep for what you get, but the overall quality and best of all the resale value, is just as high as the premium you pay originally.