Take a look here:
It's an useful comparison chart!
Cool tool -thank you for sharing! I will show that to him.
The digital picture.com site is a great tool yes, and certainly one of the most systematic and complete ones...
But remember, while very useful, the image crops are still based on one (and occationally two copies of the lenses). As Roger from lensrentals repeatedly demonstrates, there is a "spread" in sharpness for any given lens...some are notorious for variation if you were to sample 20 copies of the lens, others are tightly bunched up with little variation. Keep that in mind as you browse the t-d-p site....it is still a great resource.
My copy of the simple 24-105L is very sharp and contrasty...yet I hear some are unhappy with their copies...two possibilities: they are either pixel peeping "measurebators" who simply will not be happy with most lenses, or, their copy is truly a lemon, in which case there is still some hope to land a good copy.
This is *not* to suggest that 24-105 is the sharpest lens ever, for it isn't, just a way to exemplify the copy-variation issue. In my lens line-up, if forced to choose something, I will have to go with 135L at the top and 70-200 f2.8II as a close second. I also own the f4 version, which to my eye at least is equally sharp. I don't own any of the large white super-tele primes, but from what I hear they are all quite sharp.