Continued....
The "no flash" auto mode was no use for this photo, though; it wanted to focus on the grille in the foreground. And I can't change the focus point in that auto mode. So I changed to "P" and selected a single centre focus point - which happens to be what my 400D was set to for most of the last decade!

I have to wonder how useful 19 focus points are, to be honest. In this image the bee is right in the middle, but it has chosen to focus on something a bit closer.

Low light performance, though, is very impressive. This statue was very dark; so dark that I had trouble composing the image, and didn't expect a usable result. But it's great.

So this morning I decided to try something a bit different; the tour of Britain cycle race was passing the end of my street. I'll say straight away that this is absolutely not the sort of photography that I ever do! (Or ever plan to do, frankly). So it's really only a test of whether the camera's auto features can "do the right thing" in the hands of a naive user.
Cycle races are really parades of motorbikes and cars, with about ten seconds of blink-or-you-miss-it cyclists in the middle. The camera seemed to do a good job of the preceding and following motorbikes:


Unfortunately, the same can't be said for the cyclists. In this one, it has chosen to focus on something:

In this one though, despite there being less confusion of different depths to chose between, it has failed to do the right thing entirely:

If this had been more than just a test of a new camera I could have quite upset by how bad that one is.
Perhaps the significant difference between the motorbike and the cyclist photos is that I zoomed in more for the latter.
So in summary, I'm happy with my purchase and especially with the great low-light performance. But I continue to find that the "auto" modes are not useful to me, and wonder about the utility of having more than one central autofocus point.