I already own the 5DSR. I love it due to it's high pixel count. However, I've been eyeing the 5D4 more recently.
A couple of issues come to mind with my ownership of the 5DSR:
1. Resellability after a number of years – how much will it realistically devalue compared to the 5D4? Will I be able to sell it to buy a newer up to date camera at some point? It's a speciality camera, seemingly intended for portrait and landscape photographers of which I'm the former.
2. Do I really need 50mp? Shooting at 50MP has created a number of storage issues for me since buying it. While I appreciate what I'm able to do with it, and the detail I'm able to pull out and resolve, I'm not necessarily sure if I need it. I don't think I'll be doing much large scale printing either. But the resolution is nice for image retouching and fashion-y kind of work.
I'm weighing my options here. I suspect the 5D4 will hold it's value relatively for future 5D line releases – Like most people, I use the equity stored in my equipment to upgrade to newer equipment which has saved me thousands of dollars.
If I trade off to the 5D4, it seems I'll be getting a downgrade in resolution, but an upgrade in dynamic range and features which could potentially be useful to me. I do a lot of location shoots, so GPS marking of photographs is a pretty handy feature to have. The touch screen is nice, but I'm not quite sure how zooming in works. I zoom in to 100% a lot to check sharpness, so something to make this process faster would be nice. I don't shoot video, but if I were to get into it, the 4K would be cool.
Have any other users made this switch (or similar)? Do you regret it? Is there anything you dislike about the switch?

