I find Sienna to be very similar to Aramis's Devin.
Here's the note pyramid for Devin. It wouldn't suprise me at all if Sienna had a very similar note structure:
Bergamot, Galbanum, Artemisia, Lemon
Jasmin, Carnation, Pine, Thyme, Cinnamon
Leather, Olibanum, Cedarwood, Amber, Musk, Moss, Patchouli, Labdanum