Hi there!
Just like you I also wanted something in calfskin because I knew for a fact that I couldn't take care of the lambskin. I got the mini lady dior in supple grained calfskin and I can positively say that it does fit more than the mini lambskin version because it is less structured. BUT it is still small...I could "fit" my daily essentials but I just didn't feel comfortable. I ended up getting the limited edition lady dior in the small size (the my lady dior size) and that one is in calfskin and it is not as structured as the other my lady dior bags so more room and it is still available. It's the black one with antique gold hardware and comes with its unique set of pins. You HAVE to see this in person because the leather is just sooooo luxurious. I've taken this bag to buy other bags and just couldn't make myself buy other things because the leather on my lady dior looked way too good
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I did a quick review of some lady dior bags so check out these videos if you are interested.
Review of the supple grained leather mini:
Review of the LE MLD: