I know you already bought a beautiful Halzan -- congrats!
The comparisons above discuss the mini Halzan and the Kelly Danse, so I wanted to add some info about the differences between the Kelly Danse and the Halzan 25.
I have the Halzan 31, but it is a little too heavy for me and I don't wear it much. I love the Halzan, so looked at a mini, but it was a little too small for me. When the Halzan 25 came out I knew it was perfect!
I'll add a few pictures and some random thoughts.
Halzan 25 vs Kelly Danse
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Width of Halzan 25
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Width of Kelly Danse
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I was completely obsessed with getting a Kelly Danse and am very happy I found one. But overall I get a lot more use from my Halzan than I do my Danse. I tend to baby my Danse more as it seems a bit more delicate.
For me there are a few cons with the Danse.
1). My Danse is swfit and while I love swift, I am a little concerned about how the sharp bottom corners will hold up in swift. I like a crisp corner and I know that swift will soften over time. I have a swift Birkin that has softened over time but still has a beautiful shape, however the swift leather is much thicker on my Birkin. The Danse does come with the leather piece to put on the bottom inside of the bag to give it structure so that may help.
2). Both the Danse and the Halzan 25 are wider at the bottom than at the top, but the difference is more pronounced on the Danse.
The Danse width is only about 2 inches at the top and 2.75 inches at the bottom so that also keeps it from being able to hold much. And again with swift, the leather will show the bumps and bulges if you put a little too much in the bag.
The Halzan width is about 3 inches at the top and bottom, although where the straps attach at the top keep you from being able to use that entire width at the top.