I'm curious, how do you compare your copy of a lens to online tests of other copies or different lenses? People use different cameras, and take pictures of different things. Some of them do it better than others.
The only time I was confidently able to say that my copy of a lens was sharper than an online test was with my EF-M 18-150, where Bryan/TDP posted the usual shots of his 'enhanced ISO-12233' charts and I tested my copy of that lens on an equivalent camera (M2 vs M, essentially the same sensor), and I have the same charts that he uses. In that case, he bought another copy and tested that and it gave results similar to mine (i.e. better than his first copy). Even though I have the same charts, he uses a 45-50 MP 5-series camera for his testing, and I don't. Comparing the sharpness of even the same test chart shot with an R1 vs. an R5 won't enable me to determine the relative sharpness of my copy of an RF or EF lens vs. his.
It's not too difficult to spot results from a poor copy of a lens, but IMO confidently distinguishing between 'good' copies of a lens or comparing one lens to another requires testing both lenses under the same conditions. I don't see how one can take pictures with their lens and declare that their lens is sharper than other copies based on pictures posted by someone else online (the pictures may be sharper, but there is more that goes into a picture posted online than just the lens...subject, focus, processing, downsampling, etc.).
If you put your copy of the 70-200/2.8 II on an optical bench and quantified parameters like MTF, field curvature, etc., and compared those to data published by LensRentals for multiple copies of the same lens, that would be a valid comparison demonstrating that your lens is sharper.