I started out in digital with Canon APS-C cameras, and while I quickly transitioned to FF, I've never not had a crop body in the quiver.
My R7 replaced a 90D which replaced an 80D as an anchor to my reach kit. Anymore, my R7 lives mounted with an RF 100-500.
The rolling shutter you hear about with the R7 is real. I don't shoot a lot of stick sports so it's not obvious in my pictures. But when I'm culling bursts I can see variations between frames with wings and goose necks and the like. But if I show you one picture in isolation, the effect is pretty much unnoticeable.
I have a love/hate relationship with the sensor. It's high res for sure and there's a lot to like about that. With that 100-500 lens I can put an 800mm full-frame-equivalent angle of view on a 32.5 MP grid. To crop that out of a FF sensor you'd end up with 12-15 useful megapixels. And the R7 leaves you even more room to crop in post. I'm getting into 4-digit reach with that capability.
But those 32.5 megapixels are packed crazy tight on that little APS-C sensor. If you have good, even light and plenty of it, you'll get a decent raw file. But if you have high ISOs or broad dynamic range scenes you'll start seeing noise and other artifacts caused by that high pixel density. I have tools in post to clean up most of that, but even cleaned up and at it's best, I can never expect the R7 to produce the rich, buttery raw files that I get out of the R5 that I use 80% of the time.
I'm an old sports photographer. I love action and long lenses. I don't do that anymore at all, but I get my big glass fix with birds and wildlife. If I'm being honest, the main reason I like shooting birds is because of the gear. Back when I was shooting sports I would have had to work for Sports Illustrated to get access to an 800mm rig and I'd still only get about 6 FPS out of a motor drive with fresh batteries. Now all I have to do is put up with a little rolling shutter.
R7/500mm cropped to 20.8 MP