Quite a bit, I had a 2013 Civic, then have the Tourer after that. The seat layout is exactly the same. By having the car bigger, all the room is gained in the luggage space.
I also had a current Gen CRV before as well, I can fit more in the tourer than in the CRV.
In the Tourer, I can easily fit my FS with both wheels off without lowering the seat. There’s no way I can do that in the standard Civic. Have a look at one in a showroom.
I also found the handling to be better than the standard Civic as it is more balanced. Don’t choose the 17″ alloys though as they stick out proud of the tyres. I kerbed mine couple of times and it’s not nice.