One thing I think that needs to be remembered when comparing the A1 to the R5 is that Nikon and Canon pro bodies have not typically experienced notably larger performance gaps between them and their next tier competitors. The 5Div is a great camera and could do most of what a 1DXii could do. Likewise, the D850 and D500 could do most of what the D5/D6 could do. The value of the differences get back to what the photog wants or needs. That the R5 is an amazing camera is not questioned, nor that it can do a great many things well. However, for those who need or want the features the A1 has that the R5 doesn't, there is a huge difference between the two.