Bryan of TDP has just posted the 800mm image quality on the R5. I've linked the results with those that many of us want to see compared, the 100-400mm II + 2xTC on the 5DSR (the 5DSR ~ same IQ sensor as R5). https://www.the-digital-picture.com...meraComp=979&SampleComp=0&FLIComp=6&APIComp=0
Now, even though TDP is one of my real favourite sites and Bryan is as reliable as they come, 5-star-rated, he is looking at basically only one copy of each done at different times so you don't bet the house or buy just on his IQ charts. But, at this stage, it seems that the two lenses are very similar in IQ. It seems most likely to me that both lenses are close to being diffraction limited at f/11.
Now, even though TDP is one of my real favourite sites and Bryan is as reliable as they come, 5-star-rated, he is looking at basically only one copy of each done at different times so you don't bet the house or buy just on his IQ charts. But, at this stage, it seems that the two lenses are very similar in IQ. It seems most likely to me that both lenses are close to being diffraction limited at f/11.
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