I already owned an R5, which is a dream camera! I needed to replace an old, malfunctioning 90D and I thought I was going to get another R5 but I decided to upscale with the R5 Mark II. A weekend photo shoot recently produced remarkable images from both cameras. I keep a telephoto lens on the R5 and a 24-105 mm lens on the R5 Mark II to avoid changing lenses in the field and getting dust on the sensors. The new batteries that came with the Mark II are amazing and I'm now using them on both cameras since updating the firmware on the R5. I do landscape, wildlife, and astrophotography. It's with the astrophotography that these cameras shine brightest. Using proper techniques, you get pin-point stars with the 45 megapixel lenses when zoomed-in, not little squares. Love the R5 and the R5 Mark II!