Here is a great resource to compare various lenses from most manufacturers:
http://www.lenstip.com/index.html?te...rch&przetest=1
Go to the review and then Section 4 "Image resolution". On some (most?) lenses you will find detailed resolution measurements (in lines/mm v aperture) at centre & edge of frame (sometimes for FF & crop). In relation to the original question of something for your Canon - circa upto 150mm+, and as already suggested the Canon 70-200 / 2.8 L performs incredibly well in resolution/perceived sharpness even when compared to primes in the same focal length range. Of course if you want the widest possible aperture (1 to 2 stops faster) then primes it is.
Best
JA