David said he is using it with the 5DS R too. So it's not a question of it being optimized for this or that sensor.
Charlie. Yeah. Stitching is a pain in the ass. I don't see any reason to stitch. Not when I have 42MP to play with. I can crop 50% of the photo and STILL have more rez than my 6D. LOL.
I'm still feeling kind of uncertain about my kit. If money was no object, I would follow the model of having one Canon kit and one Sony kit with native lenses on both. I like the Sony for its resolution and the size of its lenses (even the FE lenses are a bit smaller than their Canon equiv.)
But there are still things about the Sony world that make it a bit awkward, so I do find myself thinking I'd be happy with a Canon 5DS of some sort.
Still need to go through the 1000 or so pics from my trip to Vancouver. I ended up using the Sony for 95% of those shots and the 6D a couple of times when I wanted AF with the 100-400L. All in all, I hurt my back carrying all this gear and the take away for me is that for travel, I need to be a lot more selective about what I take with me. I thought I was being selective and only took zooms this time (no primes). But that ended up working against me as my zooms are mostly heavy (100-400, 70-200, etc). I might have been better off taking the set of FD primes...
Why not? The 5DSR has also a thicker sensor glass doesnt it? Or does no antialiasing sensor mean that there is absolutely nothing in front of the sensor? Its still a mirror in between lens and sensor and a mirror or an adapter might cause problems to complex wide angle lenses. I would not exclude this as a possible reason.
But yeah, following the model of two kits makes absolutely sense.