I have a 5Dsr and love the big, raw files it produces. But I'd like to see six major improvements:
One: The camera is too big and heavy. Pare it down to the size and weight of a 5Dm4.
Two: Though I know people will say this is contradictory, I want a full, flippy, variangle touchscreen like that on the 6D2. It's strong and reliable, adds very little to the size and weight, and is immensely useful for still photography, as well as for video.
Three: the buffering time of the present camera is way too slow. Of course, it takes some time to deal with the big files, but hopefully improvements in circuitry and memory cards can make the next generation 5Dsr faster.
Four: Along those lines, we need card slots (two, please) that take faster, newer generation card types.
Five: I hardly ever shoot video, but the almost total lack of 4k in 6D2 and the very poor implementation of it in the 5D4 is outrageous and dumb. Canon has to compete with Sony, Fuji and Lumix, and while Canon cannot be expected to deliver enormous, 50 MP, full frame, 4k in this camera, it has got to give videographers and hybrid photographers something in 4k that they can use and which is competitive.
Six: Better low-light performance. Hopefully the 6D2 will be a low-light champion, but improvements in the 5Dsr would also be very welcome.
Please note that I'm not asking for more megapixels, though Canon will probaly add a few. More important now, I think, is lowlight capability, dynamic range, and a bigger buffer.
