Sure.
Sadie is a little bigger (wider) and it's a flap purse so it closes which I like a lot more than the Minetta. In fact, an open purse almost was a deal breaker for me with the Minetta. But I decided she just doesn't make the trip home to NYC with me.
Where I normally am in my daily life, an open purse doesn't matter so much and I keep my wallet all the way to the bottom plus always have the Minetta snapped close and it is a pretty secure fit. Still have to say it bothers me though. I'm just a city girl at heart.
Honestly, apart from that, they are pretty similar just a different configuration. Minetta has an open pocket on the front and is tall. Sadie has her's on the back and is, of course, wider. Both have about the same space but Sadie's an easier fit because you don't have the middle pocket compartment like the Minetta does. Sadie is one pure space not a bunch of smaller pockets to fill here and there although the Minetta's pockets are plenty roomy. Your stuff is just separated and that may be annoying for some people. It's annoyed me from time to time.
Who do I love more? Sadie because I find she is easier to use for the way I like to use a purse. Still, Minetta is a nice change up without being too radically different from my first love. I have used them the most since Christmas with Madeline being pulled out from time to time here and there.
I hope this helps you. Please let me know if I can answer anything specific.