Originally posted by Dan Rentea If the images were not taken in the same conditions at the same time, then you can't draw a conclusion based on some random images. I have images taken at ISO 2000 better than others taken at ISO 1000 with the same camera because there were different conditions (the quality of light was different, etc.).
I've compared image area with similar light levels. And Photonstophoton has published measurements for the A7RIV, that just confirm my impression, the DR on the A7RIV isn't higher than K1 DR, there is even some sort of drop between ISO100 and ISO50.
But, I still see an advantage of 61Mp vs 36Mp, 61Mp much reduced the risk of color moiré, and I can also confirm this buy comparing repetitive image patterns sampled by K1, D850, GFX50 and GFX100. The images from GFX100 are free of moiré, whereas the same image with GFX50 , K1 and D850 does show color moiré. That's because at the 100Mp density on MF or 61Mp density FF, the lens acts as the optical low pass filter relative to pixel pitch.
Depends what we photograph, for models / clothes, the risk of moiré is real, for landscapes not so much.