will this shoe stretch out at all since its leather?

I think I've had mine for ~3 months and gotten an average 4 days of use within that time. They stretch, definitely. If I could go back and get another 1/2 size smaller, I would. Still an absolutely awesome shoe, but they definitely stretch...

I have these and they've probably stretched a half size in 2 months

Agree with Jeremy, they stretch a bit. I usually wear 44 for street shoes and I got 2 pairs of 42. At the beginning they were painful but now they're totally fine. I might bump up to 42.5 for outdoors though so I don't have to take them off after each climbs.

I agree 100 percent with jeremy usry's answer to this question.

I wear these shoes alot! they stretch quite a bit. don't misinform just from reading a shoe description. give input if you have significant climb time in the shoe. btw, the tighter you buy them the more they will stretch. my miura vs started off too painful to bear at time. they have stretched AT LEAST half a size. and they now fit very comfortably. i usually wear 43.5-44 comfortably in a flat last shoe. i bought the miura vs in a 42. they have stretched over time and now are very comfortable. i have alot of climbing time in these shoes. i mean alot. they are awesome shoes. fit them very snug and go thru the break in process of pain. you will be VERY HAPPY with them.

Beg to differ. Sportiva knows this is an aggressive shoe, which you don't want to stretch, so they put in a synthetic liner. It won't stretch. If you don't believe me, check out Sportiva's description of the shoe on their website (http://www.sportiva.com/products/prod/555) that says the same thing.