REGARDING TESTPICTURES I have seen he's test pictures before, http://www.the-digital-picture.com, totally out of control and no declaration in how many meters etc to the test target, different combos are optimized for different distance.Different super telephoto lenses are optimized for different distances
So here are a real measurements from real MTF test, and by Hasselblads MTF lab IN GOTHENBURG and for the magazine Foto here in Sweden. They conclude , there are no difference between for example 400/2.8 , 500/4 600/4 FROM NIKON AND CANON, (sorry Krille you can sue me for showing this sides from your excellent Photo magazine FOTO)
THE 4 TESTED LENSES ARE EQUAL NOW you can believe in what you want regarding one or others companies sovereignty and about for example fluorite glass and there are a lot more companies than Nikon, Canon how can build decent lenses . example Zeiss.Leitz, Sigma,Pentax, Tokina,Tamron etc etc
Im sorry that Im erasing yet another myth
And if Jrista or Neuro want to discuss Hasselblad credibility in their measurements, I suggest that they directly address Per Nordlund via e-mail, he is the lens expert expert at Hasselblad
pictures taken from the magazine with a iPhone
Thank you for publishing this page from the "FOTO" magazine! Excellent and I hope no one will sue you for this! :-)
So from this page I can read that the EF300mm f/2.8L IS II USM is "one of the very best lenses we (ever/so far) tested" freely translated from the page.
Not really understanding the concept of what this is about: " the higher frequency 40 cycles/mm" where the page text tells that for both 500 mm -tele lenses the curves are substantially lower than for the 300 mm - lens.
The test shows that the EF300mm f/2.8L IS II USM also gives a better IQ with a small amount and also giving better contrast (compared to the Canon 500/4 II and Nikon 500/4 (10 cycles/mm), but the differences are not significantly big between the 500/4 and the EF300/2.8L II.
In addition the text from this page also, states that the 500mm and 600mm lenses from both Canon and Nikon are optically totally like-valued (lik=same + värdiga=value) [when translated from Swedish.]
I hope my short direct translation from Swedish language into English, might help you native English speaking in order to convey what this magazine FOTO test, is stating in their test with only short text.
Wishing you all the very Best and happy shootings!