Not quite. I ran a sigma 150-600 on my 7d2 and for a price of 4k Australian i had a field of view equivalent to a FF with nearly 1000mm of focal length. That is a pretty damn affordable wildlife setup.Other than the issue of price, that only works if the crop frame has higher pixel density than the FF. With an R5s likely coming down the pike, I doubt that will be case, so we are down to the only reason for the camera being to save a couple of grand on body to be used with $10k lenses. Seems like a pretty thin case.