This would be a possible option for me along side an R5. My first preference would be a light weight full frame 600mm lens around the f/5 range. But if the R7 does eventuate it will be an interesting option looking at cost and image quality. It's nice to dreamThis is not meant to substitute for the R5, R6 or R3, it is meant to be a companion body. Use the full frame in poor light and sacrifice some resolution. Use the crop R7 in good light when you need more "reach."