like you, I am new to this forum. A long time reader, first post.
I will not go into details about the differences between those cameras, there's a lot of people here who know them way better than me
I have the 5DIII + 60D (same sensor as 650D). But, I do see a lot of difference in my pictures. Maybe not in well lit daylight pictures. Even compact cameras handle those situations quite well, that's why the companies sell tons of them.
But, here is my theory on why you don't see "any" differences in your pictures; when you open the box & power up the camera & start taking pictures, none of the cameras are set to "neutral" (in lack of better word).
When you hit the shutter, light reaches the sensors. Then the cameras not just records that light (like your analog film would do), but to a large degree "adds a little of this, and maybe even removes a little of that" (this would be the film processing you are used to) when creating the .jpg you ended up printing. It is a bit like not knowing what film you put inside, nor where it was processed & developed.
- I am not saying those images are not worth keeping because of that in camera processing, but it is just not what you (or the camera) saw. It is what the camera ended up with as a final processed image, a lot of times those pictures look great. Sometimes greater then what was actually seen, ie. because of added colours etc..
If you take both cameras, and set them to "neutral" (ie; picture style, auto optimizing, noise reduction ... more?), then take a picture. You will "see more of the sensors" and less of the software inside the camera.
- I don't mean you should turn all of these functions off just to try to create images that are worse than they could be, but a lot of us like to process the images "ourselves" (on the computer at home) instead of in-camera.
I think you'll be happy with either one of the cameras, but for very different reasons.
The cameras you've bought are very capable of creating images, most of todays cameras are
And in the end, maybe it all boils down to interest + time available + what will YOUR actual focus be on the Africa journey? Exploring your surroundings & beeing present with your wife vs creating memories or maybe even art?