Sidi's - at least the Sidi Doms - run small. I wear a (women's) size 6 in a street shoe (clogs, running shoes, etc.), but my Sidi Doms are a size 38.
If you look at most shoe conversion charts, a size 38 is a women's 7 1/2. If I went by the strict conversion from my street shoe size I would be wearing a size 36, not the 38 that I actually need. Here's a link to a shoe conversion chart in case you need it: http://www.i18nguy.com/l10n/shoes.html. There are others out there too if you don't like this one.
But - if your toes hit the end of the shoe then I'd say they are too short for you. If it were me I'd order a larger size.
--- Denise