Hmm...
I'm a doer.....I'll make my own conclusions with my own personal gear and compare. If people cannot tell the difference while post processing your own images from an X-t2/Xpro2 w/fuji 16mm to a 5dmk4 with 24Lmk2 I cannot comment on their vision. [...] However you do not hear me ask people to prove it...prove it..... I'll figure it out myself!
Actually 70-200 f/2.8IS from mk1 to mk2 wasn't a big upgrade. I personally owned 70-200mm f2.8 non IS, 70-200mm f2.8 IS I and 70-200mm f2.8 IS II and 135L. Did all the testing side by side. Very small differences IMHO.
Bobby I think a large part of the Canon community would be very surprised to hear that there is little difference between 70-200 f2.8 IS mk1 vs mk2. It was my eye opener in prime lens quality in a zoom.

The irony 




